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Quick answer from a licensed plumber: The valves in a washing machine outlet box are replaceable parts, and they are matched by the tailpiece, not the box: F1807 crimp PEX, F1960 expansion PEX, copper sweat, CPVC, compression, push-connect, or (Sioux Chief) MIP and press. Name the box first (Oatey Quadtro, Centro II or Eliminator; Sioux Chief OxBox), then buy the valve with the same connection as the pipe under it, with arrestors if the original had them. On September 25, 2026 the only Oatey parts that were Amazon-shipped or sold with a part number in the listing were the 38871 copper valve and the 38941 Quadtro face plate.
For an Oatey box plumbed in copper: the Oatey 38871 washing machine valve, 3/4-inch, copper (not linked: third-party seller only on 10/3/2026; the listing names no box family, so confirm it against Oatey’s parts list for your box before ordering).
Step 1: Name the Box
The box is the plastic frame in the wall behind the washer that holds the two supply valves and the 2-inch drain. Oatey and Sioux Chief are the two makers covered here; Oatey lists the valves as their own catalog category and Sioux Chief calls its valves replaceable. Oatey: its boxes come “with options in multiple sizes, mounting configurations, and tailpiece types,” and its catalog has categories for “SUPPLY BOX VALVES, LINES, & RISERS” and “SUPPLY BOX AND STOP VALVES.” Sioux Chief: “All Sioux Chief laundry outlet boxes incorporate patented, replaceable valves with test caps.” The face plate usually carries the brand name; the maker’s product pages sort the families by their features, below.
| Box | What the maker says | Valve mounting | Variations |
|---|---|---|---|
| Oatey Quadtro | “The proprietary lock and load valves enable left, right or center positioning of the drain pipe. This easy-to-install box includes all necessary support brackets to mount the water supply valves from the top or bottom.” | Top or bottom | 27, by tailpiece: F1960 PEX, F1807 PEX, Viega PEX press, copper sweat, CPVC, compression, push connect, with or without hammer arrestors |
| Oatey Centro II | “takes up less space, fitting almost anywhere for commercial and residential applications. It is made of durable PVC and can be mounted with the valves on the top or bottom.” | Top or bottom | 30, assembled or unassembled, by tailpiece |
| Oatey Eliminator | “a supply valve and waste drain recessed into the wall with an additional drain port. Its secondary drain port is commonly used for AC condensate, water softener, discharge and /or humidifier lines.” | Top mount versions | 18, including a “Plain Box, No Valves” contractor pack |
| Sioux Chief OxBox (696 series) | “The OxBox™ laundry box system uses a unique, two-box design to provide an easy, ‘Flip & Clip’ installation. The steel box clip mounts boxes securely in place and allows installer to configure for left or right drain, and top or bottom supply.” | Top or bottom | 77 laundry items by connection: F1807, F1960, F3347, CPVC, MIP, FSWT, MSWT, press, Everloc+, push CTS; “Connection 1 Size 1/2 IN” |
Step 2: Match the Valve Tailpiece to the Pipe
The part that leaks or seizes is the valve, and the valve is chosen by how it joins the pipe, not by the box. Oatey’s Quadtro variants spell it out in the names: “Oatey® Quadtro, 1/4 Turn, F1960 PEX Washing Machine Outlet Box,” “1/4 Turn, F1807, Washing Machine Outlet Box,” “1/4 Turn, Copper Washing Machine Outlet Box,” “1/4 Turn, Compression, Washing Machine Outlet Box,” “1/4 Turn, Push Connect,” and a “Brass Boiler Drain, Copper” version. F1807 is crimp-ring PEX, F1960 is cold-expansion PEX, copper is sweat, and Sioux Chief adds MIP (male pipe thread), FSWT/MSWT (female and male sweat) and press. The pipe entering the bottom of the box decides which replacement valve you can buy.
| Tailpiece on the valve | Pipe it fits | Tell-tale |
|---|---|---|
| F1807 (crimp PEX) | 1/2″ PEX with a copper crimp ring or stainless clamp | Ring or clamp squeezed over the pipe on the barb |
| F1960 (cold expansion PEX) | 1/2″ PEX-A with an expansion ring | Wide plastic ring, no crimp; the pipe was expanded over the barb |
| Copper sweat | 1/2″ copper | Soldered joint at the valve |
| CPVC | 1/2″ CPVC | Solvent-cemented tan pipe (PVC vs CPVC) |
| Compression / push connect | 1/2″ copper, PEX or CPVC | A nut and ferrule, or a push fitting collar |
| MIP / press (Sioux Chief) | Threaded adapter, or copper with a press ring | Thread at the valve, or a pressed collar |
I send an occasional note when a new guide goes up — repairs worth doing yourself, and the parts that actually last. No spam, no course funnel; written by a licensed Georgia plumber.
Step 3: Replace the Valve, Not the Box
Oatey calls the Quadtro’s valves “lock and load valves” and lists supply box valves as their own catalog category; on a Sioux Chief OxBox the maker’s point is that the valve is “replaceable” and ships with a test cap. Amazon lists an Oatey valve on its own (“Oatey Washing Machine Valve, 3/4 in, Copper, Blue 38871”; the title says nothing about which box it fits, and “Blue” may mean the cold-side valve), and a face plate on its own: the 38941 is “Compatible with Quadtro center and offset washing machine outlet boxes (sold separately),” with a “Snap-on frame accommodates up to 1 in. of drywall” and “Faceplate dimensions: 11-3/4 in. W x 10-1/8 in. H.”
Oatey parts that Amazon shipped or sold on September 25, 2026:
- Oatey 38871 washing machine valve, 3/4-inch, copper, blue — not linked: third-party seller only on 10/3/2026; listed as 3/4 in, copper, so it is for a box plumbed in copper, not PEX or CPVC; confirm the box family against Oatey’s parts list.
- Oatey 38941 plastic Quadtro washing machine box face plate — not linked: third-party seller only on 10/4/2026; the listing says it “Allows for top or bottom valve mounting (brackets sold separately)” and has an “Easy-to-remove knockout.”
Whole boxes are another matter on Amazon. On September 25, 2026 the Oatey 38528, 38530, 38541, 38543, 38633 and Centro listings were third-party sellers, down to a few units, or had no buy box, and the same was true of every Sioux Chief 696 box, so none is linked; the makers’ variant lists are in the sources.
If the Box Itself Has to Go
Sioux Chief’s OxBox is built for that: “Separate boxes for supply and drainage for flexible layout,” “Mounts securely over stud or between studs,” “Included debris covers protect boxes from dust, mud, and paint,” and “Test cap in drain box removes easily with pliers.” The fire-rated 696R version is “Listed by Warnock Hersey to meet: ASTM E-814, CAN/ULC S115,” which matters in a rated wall between a garage and living space. Oatey’s Quadtro box listings say the box has a “2 in. drain opening fits PVC or ABS Sch. 40 DWV pipe” and an “Easy-to-remove, tool-free 1/4-turn knockout.” Match the drain position (left, right or center) and the standpipe height to what is in the wall.
FAQ
Can I replace just the valve in a washing machine outlet box?
Yes on the common boxes. Oatey lists supply box valves as their own category and Sioux Chief says all its laundry boxes use replaceable valves with test caps. Buy the valve with the same tailpiece as the pipe under the box.
How do I know which Oatey outlet box I have?
By the frame. Oatey’s Quadtro allows left, right or center drain positioning with valves mounted top or bottom; the Centro II is the compact PVC box; the Eliminator has a second drain port for condensate or softener discharge. The faceplate is sold separately (38941 for Quadtro) and snaps on over up to 1 inch of drywall.
What does F1807 or F1960 mean on an outlet box?
The PEX connection standard on the valve tailpiece: F1807 is crimp-ring PEX and F1960 is cold-expansion PEX. Oatey and Sioux Chief also list copper sweat, CPVC, compression, push-connect, MIP and press versions.
Does a washing machine outlet box need water hammer arrestors?
Both makers list their boxes with or without arrestors. If the box was sold as a hammer version, replace the valve with the arrestor version or the banging returns; our water hammer arrestor guide covers add-on units.
Is a Sioux Chief OxBox fire rated?
The 696R series is listed by Warnock Hersey to ASTM E-814 and CAN/ULC S115 per Sioux Chief; the standard 696 boxes are not sold as fire-rated.
Why Trust Plumbing Picks
Plumbing Picks is written by a licensed Georgia journeyman plumber. Every part number, model list, size, setting and fit on this page comes from the manufacturer pages and documents listed below, which we opened and read; product details come from those makers and from the Amazon listings, not from hands-on testing. No product on this page is linked to Amazon right now; the notes above give each listing’s seller or stock on the day we checked. Where a link goes to Amazon we may earn a commission at no extra cost to you. Nobody pays to be included here. More on who writes this and how we pick.
Sources
- Oatey: Washing Machine Outlet Boxes (category)
- Oatey: Quadtro 1/4-Turn Washing Machine Outlet Boxes (27 variations)
- Oatey: Centro II Washing Machine Outlet Boxes (30 variations)
- Oatey: Eliminator Washing Machine Outlet Boxes (18 variations)
- Sioux Chief: Laundry Outlet Boxes & Panels (OxBox; replaceable valves)
- Sioux Chief: 696RG2303XF OxBox 3/4″ outlet, fire-rated, 1/2″ F1807 PEX
Bottom Line
Shut the water, pull the faceplate, read the frame, and look at the pipe under the valve. Buy the same brand’s valve in the same tailpiece; keep the arrestors if you had them. The box only comes out if the frame or drain is wrong.