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How the three compare on our spec score
Five checks from American Standard’s spec sheets and product pages, equal weight. Rules are in the method section.
PlumbingPicks spec score out of 10, from American Standard’s spec sheets and product pages, read Oct 24, 2026. Not a test of our own or a customer rating.
American Standard builds all three alike: 18 gauge steel, a 9 in. bowl, sound pads and an undercoating. The split is what each sheet states. Both Danville sheets give 18-10 chrome nickel steel but say sink only.
The Portsmouth sheet lists a waste fitting and undermount clips but no steel grade. A sheet that leaves something out scores 0 on it, so all three score 8.0, and the tie goes to the biggest bowl floor (rule in the method box).
The bigger choice is size. The Danville 30 × 18 needs a 36 in. cabinet, per its sheet; the Portsmouth 23 × 18 and the Danville 23 × 21 need 30 in. The checker below tests your cabinet and your biggest pan against each bowl.
Each sink, in detail
What American Standard publishes, what it means under your counter, and where each lost points.
Best for the widest bowl
Danville 30 × 18
American Standard Danville 30 x 18 single-bowl undermount stainless steel kitchen sink 18SB.301800S.075
You want the widest bowl that fits a 36 in. base, for sheet pans and long roasting pans.
Skip it if
You want the drain fitting in the box; the Portsmouth 23 × 18 includes one.
American Standard’s Danville 30 × 18 is the sink I’d pick for the widest bowl, and I’ve used it. Its bowl is 28 in. wide, 15-15/16 in. front to back and 9 in. deep, per American Standard’s sheet.
Outside it’s 30 by 18 by 9 in., and the sheet says a 36 in. cabinet is required. It’s for undermount installation, with a cutout template and instructions included.
The sheet lists 18 gauge stainless steel with 18-10 chrome nickel content, meeting ASME A112.19.3, and a limited lifetime warranty.
American Standard’s product page says it has SoundSecure+ sound pads for reduced noise and StoneLock undercoating against vibration and condensation, and calls the 9 in. depth generous for large pots and pans.
The sheet also says sink only, waste fitting not included. Plan on buying a strainer or a disposer flange, even though the listing photo shows a strainer in the bowl.
For the countertop cut, American Standard recommends using the basin as a template and cutting the countertop 1-1/2 in. inside the basin contour.
The sheet’s drawing shows the 3-9/16 in. drain hole centered in the bowl. It also notes that the supply and P-trap locations it shows are suggestions only, and that sealing compound is supplied by others.
By my math the bowl floor is about 446 sq in., the biggest of the three. My call: a centered drain puts the disposer in the middle of the cabinet, which can crowd a pull-out trash bin.
Where it lost points: no waste fitting in the box scored 0.
My call: pick this one over the Portsmouth 23 × 18 when you have a 36 in. base and wash long pans flat; you’ll buy the drain fitting separately.
Best for big round pots
Danville 23 × 21
American Standard Danville 23 x 21 single-bowl undermount stainless steel kitchen sink 18SB.232100S.075
Your sink base is 30 in., or you want a squarer bowl that takes a big stockpot.
Skip it if
You wash long sheet pans flat; the bowl is 21 in. wide.
American Standard’s Danville 23 × 21 is the sink I’d pick for big round pots, and I’ve used it. The sheet says a 30 in. cabinet is required, the same as the Portsmouth 23 × 18.
It’s 23 by 21 by 9 in. outside, and the bowl is 21 in. wide, 19 in. front to back and 9 in. deep. That’s the most front-to-back room of the three, from what American Standard’s product page calls a unique curved back wall.
The sheet lists 18 gauge stainless steel with 18-10 chrome nickel content, ASME A112.19.3, undermount installation, a cutout template and a limited lifetime warranty.
American Standard’s page lists the same SoundSecure+ sound pads and StoneLock undercoating as the 30 in. Danville.
Like the bigger Danville, the sheet says sink only, waste fitting not included, and American Standard recommends cutting the countertop 1-1/2 in. inside the basin contour.
The drain sits off center on the sheet’s drawing: the 3-9/16 in. hole is 11-5/8 in. from one side and 6-3/16 in. from another edge.
By my math the bowl floor is about 399 sq in., roughly 47 less than the Danville 30 × 18 and 57 more than the Portsmouth 23 × 18. The extra front-to-back depth is what lets a round stockpot sit flat, while long pans may have to go in at an angle.
Its sheet says the dimensions are nominal and may vary within ANSI A112.19.3 tolerances, and that sealing compound is supplied by others. Measure the sink itself before the final counter cut.
Where it lost points: no waste fitting in the box scored 0.
My call: in a small kitchen, a single 21 in. bowl beats a cramped double bowl. Measure your biggest pan first, though; the checker below does the math.
Best for parts in the box
Portsmouth 23 × 18
American Standard Portsmouth 23 x 18 single-bowl undermount stainless steel kitchen sink 18SB.9231800S.075
You have a 30 in. or bigger sink base and want the drain fitting and clips in the same box as the sink.
Skip it if
You wash long sheet pans flat; the Danville 30 × 18’s bowl is 28 in. wide.
American Standard’s Portsmouth 23 × 18 is the undermount sink I’d pick when you want the drain fitting in the box, and I’ve used it. It’s the only one of the three whose spec sheet lists parts in the box.
The sheet lists the 9028000.075 waste fitting and 791676-100.0070A undermount sink clips, along with a cutout template and instructions. With the Danville models you buy the drain fitting separately.
It’s 23-3/8 by 17-3/4 by 9 in. outside, with a bowl 21-3/8 in. wide, 16 in. front to back and 9 in. deep. The sheet says a 30 in. cabinet is required, so it fits the same small bases as the Danville 23 × 21.
The drain is centered: the drawing puts the 3-9/16 in. hole 11-11/16 in. from the end and 8-7/8 in. from the back, half of each outside size. By my math the bowl floor is about 342 sq in., the smallest of the three.
American Standard lists side and bottom sound deadening pads with an undercoating. Its product page calls them SoundSecure+ rubber pads and StoneLock multi-layer spray insulation, against noise, vibration and condensation under the sink.
The sheet calls for 18 gauge stainless steel meeting ASME A112.19.3, with a limited lifetime warranty. An optional bottom grid, 8452.231700.075, is listed for it and sold separately.
The sheet’s drawing gives the inside width as 21-7/16 in. where its text says 21-3/8; I use the text and round down for pan fit.
Where it lost points: its sheet doesn’t state the steel grade, which scored 0, where the Danville sheets say 18-10 chrome nickel.
My call: set it with the template, check the clip locations against your countertop fabricator’s plan, and order the grid at the same time if you wash heavy pots.
The three sinks side by side
From American Standard’s spec sheets. Scroll sideways on a phone.
All three are 9 in. deep and carry American Standard’s limited lifetime warranty. My call: choose by cabinet first, then by the pan you wash most.
Will it fit your cabinet and your biggest pan?
Enter your sink base width and the pan you need to lay flat in the bowl. Bowl sizes are from American Standard’s sheets.
If your sink base is 30 in. wide, the Danville 30 × 18 is ruled out by its own sheet. My call: open the cabinet doors and measure inside between the side panels too, because face frames and false fronts eat into the space the sink and clips need.
What comes in the box, and what to buy
From American Standard’s spec sheets and its stainless sink instructions.
Part
Portsmouth 23 × 18
Danville 30 × 18 and 23 × 21
Sink
Yes
Yes
Waste fitting (strainer)
9028000.075 included
Not included
Undermount clips
791676-100.0070A included
Not listed on the sheet
Cutout template and instructions
Yes
Yes
Faucet
Not included
Not included
Sealant
Supplied by others
Supplied by others
Bottom grid
Optional 8452.231700.075
Not listed
American Standard’s instructions list the tools: adjustable wrench, channel lock pliers, screwdrivers, silicone sealant, mineral spirits, pipe wrench, putty knife, drill, saber saw, basin wrench, plumber’s putty or caulk, tubing cutter, tape measure, hacksaw and a level.
They say your sink may not come with a strainer and faucet, in which case you buy them separately. For the strainer, see our kitchen sink strainer guide, and for the faucet, kitchen faucets.
Where the drain sits, and why it matters
From the drawings on American Standard’s spec sheets.
Sink
Drain hole
Drain position on the drawing
Bowl floor (my math)
Portsmouth 23 × 18
3-9/16 in.
Centered: 11-11/16 in. from the end, 8-7/8 in. from the back
About 342 sq in.
Danville 30 × 18
3-9/16 in.
Centered
About 446 sq in.
Danville 23 × 21
3-9/16 in.
Off center: 11-5/8 in. from one side
About 399 sq in.
Every sheet says the supply and P-trap locations it shows are suggestions, and that fittings are not included with the fixture and must be ordered separately. A 3-9/16 in. hole is the standard size for a basket strainer or a disposer flange.
My call: an off-center drain like the Danville 23 × 21’s moves the trap and any disposer toward one side of the sink base, which leaves more room on the other side for a pull-out bin or a water filter. A centered drain, like both other picks’, splits the cabinet in half. Check where your wall drain stub sits before you choose.
Cutting the counter for an undermount sink
From American Standard’s Danville sheets and its sink instructions.
1
Check below and above
American Standard says make sure no cabinets or plumbing block the cutout.
2
Use the basin as the template
Its Danville sheets recommend tracing the basin to get the contour.
3
Cut 1-1/2 in. inside
Cut the countertop 1-1/2 in. inside the basin contour, per the Danville sheets.
4
Line it up with the plumbing
Place the template and check it lines up with the drain and supplies.
5
Dry fit the drain
Connect the drain hand tight; you may need to cut the tailpiece or the trap’s horizontal leg.
Undermount sinks hang from the countertop, so the countertop has to be cut to the sink. My call: have the fabricator cut it in the shop, and give them the exact model number and the spec sheet, not just “30 in. sink,” because a nominal size isn’t the cut size: the Portsmouth sold as 23 × 18 measures 23-3/8 × 17-3/4 in. on its sheet.
What the IRC says about the sink’s drain
From IRC 2021 chapter 27. Your local code may add to it.
Rule
IRC 2021
What it means for you
Sink waste outlet
P2714.1: at least 1-1/2 in., with a strainer, crossbar or other device
Every pick needs a strainer or disposer flange
Disposer drain
P2716.1: at least 1-1/2 in.
Standard sink drains meet it
Disposer needs a faucet
P2716.2
Every sink with a disposer has a faucet
Dishwasher backflow
P2717.1: air gap per ASME A112.1.3 or A112.1.2
Check what your local code accepts
Dishwasher drain
P2717.2: trap at least 1-1/2 in.; discharge hose rises to the underside of the counter
Fasten the high loop before connecting
Slip joints
P2704.1: accessible, with an opening at least 12 in. in its smallest dimension
Keep the trap reachable
The sink itself only has to meet its fixture standard; American Standard lists ASME A112.19.3 on all three sheets. Our garbage disposal guide covers the disposer side.
Do sound pads and undercoating matter?
From American Standard’s product pages and sheets.
Pads on all three
Portsmouth: side and bottom pads with undercoating. Danville: SoundSecure+ pads.
Undercoating
Danville’s StoneLock undercoating is for vibration and condensation, per AS.
Gauge is the same
All three are 18 gauge, so none is heavier steel than the others.
No sound rating
American Standard publishes no decibel figure, so I can’t rank them on noise.
Condensation matters under a sink: cold water in a steel bowl can sweat into the cabinet. My call: with any of these, keep the factory undercoating intact when the fabricator handles the sink, and don’t scrape it to make clips fit.
Keeping stainless looking new
From American Standard’s care section for stainless sinks.
Do
Don’t
Clean with mild dish detergent and water, rinse and dry
Use scouring powder or steel wool
Wipe up acidic foods (juices, salt, mustard, mayonnaise) right away
Let water dry on the steel; it leaves a gray film
Use a stainless polish for stubborn spots
Let chlorine solutions sit on it
Rub dull spots with chalk on a soft cloth
Use silver polish; it leaves spots that won’t come off
American Standard also says scratches show more when a sink is new and smooth out with use. A bottom grid, offered for the Portsmouth, keeps pots off the steel.
Other American Standard sinks I left out
Different kinds, so they aren’t scored against these three. All were in stock on Amazon on Oct 24, 2026.
Do you want the drain fitting and clips in the box?
Portsmouth 23 × 18
Keep going
Do you wash long sheet pans flat?
Danville 30 × 18
Portsmouth 23 × 18
Questions people ask
What gauge are American Standard stainless sinks?
All three here are 18 gauge, per American Standard’s spec sheets.
Does the Danville come with a drain?
No. Its sheet says sink only, waste fitting not included.
Does the Portsmouth come with a drain?
Yes. Its sheet lists the 9028000.075 waste fitting and undermount clips.
What size cabinet does a 30 x 18 sink need?
A 36 in. cabinet, per the Danville 30 × 18 sheet.
What fits a 30 in. cabinet?
The Portsmouth 23 × 18 and the Danville 23 × 21, per their sheets.
How deep are these sinks?
All three bowls are 9 in. deep.
What is 18-10 stainless?
Chrome nickel content listed on the Danville sheets; the Portsmouth sheet doesn’t state it.
What warranty do American Standard sinks have?
A limited lifetime warranty on all three, per the sheets.
How do I cut the countertop?
American Standard recommends cutting 1-1/2 in. inside the basin contour, using the basin as a template.
Can I put a garbage disposal on these?
The IRC wants a drain of at least 1-1/2 in. for a disposer; standard sink drains meet that.
Can I use steel wool on stainless?
No. American Standard says it scratches and can cause rust stains.
Why does my stainless sink have gray stains?
American Standard says water left to dry leaves a gray build-up.
Is there a bottom grid for the Portsmouth?
Yes, 8452.231700.075 for the 23 × 18, per its sheet.
Are these sinks ADA compliant?
Their sheets don’t say ADA; the Pekoe and Colony models are the ADA ones.
Which is quieter?
American Standard publishes no noise rating; all three have pads and undercoating.
How we picked these
Why trust me
I’m Isaac Daniels, a licensed journeyman plumber in Georgia (license #JP507711), and I’ve used all three picks. Sizes, cabinet minimums, parts and warranty come from American Standard’s spec sheets and product pages; code rules from the IRC 2021, all read Oct 24, 2026.
How I pick
One kind of product: American Standard single-bowl undermount stainless sinks with published spec sheets, new and in stock on Amazon the same day.
Each listing was matched to American Standard’s model number.
Each card’s spec score comes from the five checks below. All three score 7.0 or higher.
Where a listing and American Standard disagree, American Standard’s sheet is used.
The spec score, check by check
Each check scores 0 to 10 and counts one fifth. It’s our score from American Standard’s documents, not a test of our own or a customer rating.
Check (weight)
How it’s scored
18 gauge steel (⅕)
10 for 18 gauge or heavier; 7 for 20 gauge; 5 for thinner; 0 when not stated
9 in. bowl depth (⅕)
10 for 9 in. or more; 8 for 8 in.; 6 for less; 0 when not stated
Parts in the box (⅕)
10 when the sheet lists the waste fitting in the box; 0 when it says sink only or doesn’t say
Sound pads and coating (⅕)
10 for pads and undercoating; 7 for pads only; 0 when the sheet lists neither
Steel grade stated (⅕)
10 when the sheet or page states the chrome nickel grade; 0 when it doesn’t
Total
Average of the checks, to one decimal
Ties
Broken by bowl floor area from the sheet’s bowl dimensions, biggest first, because a bigger floor holds more pans flat
Pick
Gauge
Depth
Parts
Sound
Grade
Score
Danville 30 × 18
10
10
0
10
10
8.0
Danville 23 × 21
10
10
0
10
10
8.0
Portsmouth 23 × 18
10
10
10
10
0
8.0
Sources
American Standard spec sheets: Portsmouth 23 × 18 18SB.9231800S.075 (2/17), Danville 30 × 18 18SB.301800S.075 (1/23), Danville 23 × 21 18SB.232100S.075 (1/23), from lixil.cdn.celum.cloud. Read Oct 24, 2026.
American Standard product pages for the three sinks (americanstandard-us.com). Read Oct 24, 2026.
American Standard, stainless steel drop-in and undercounter sink installation instructions and care, 791624-100.
International Code Council, 2021 International Residential Code, chapter 27: P2704.1, P2714.1, P2716.1, P2716.2, P2717.1, P2717.2 (codes.iccsafe.org). Read Oct 24, 2026.
Amazon listing text and photos for B06XC6B96K, B0B36CXRJV, B0B3695JF9, B07PWHCPL5, B06XC7QWVS and B07Q1Z83K5, read through Amazon’s product data, Oct 24, 2026.
Search volume for “american standard kitchen sink” from Semrush, Oct 24, 2026.
