For a standard 24 × 24-inch mop sink, the Zurn Z1996-24 composite basin or the Mustee 63M Durastone basin both connect to a 3-inch drain; for more room, the Zurn Z1996-36 is 24 × 36 inches with a mop shelf. Plan the floor drain before the basin goes in, and check your local code for the faucet’s backflow protection.
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This guide covers floor-mounted mop service basins for janitor closets, garages and mudrooms.
Mop sinks compared
| Basin | Size | Material and drain |
|---|---|---|
| Zurn Z1996-24 | 24 × 24 × 10 in. | Molded composite; PVC drain body, 3 in. gasketed outlet |
| Mustee 63M | 24 × 24 × 10 in. | Durastone fiberglass; molded-in drain for 3 in. pipe |
| Zurn Z1996-36 | 24 × 36 × 10 in. | Molded composite with mop shelf; 3 in. gasketed outlet |
A mop sink, also called a mop service basin, sits on the floor with a low curb so you can set a bucket in it, pour out dirty water and rinse mops. Businesses use them in janitor closets; homeowners add them in garages, mudrooms and basements for cleaning and pet washing.
All three basins here connect to a 3-inch drain, so plan the drain line and trap before you pour or patch the floor.
Zurn Z1996-24: square composite basin
Choose the Zurn Z1996-24 for a standard square janitor closet basin. Zurn’s spec sheet (maker page: files.zurn.com/spec-sheets/z1996-24.pdf) lists a 24 × 24 × 10-inch molded high-density composite basin with a PVC drain body, a stainless steel strainer and a 3-inch gasketed outlet connection, about 50 pounds, meeting ANSI Z124.6 and listed by CSA and IAPMO. Zurn offers options such as a white body, bumper guards, hose and bracket, mop hanger, a no-hub drain gasket, pipe reducers and stainless wall guards.
On October 15, 2026, the standard new offer sold by Amazon.com showed stock with model Z1996-24.
Check Zurn Z1996-24 mop service basin on Amazon →
Mustee 63M: Durastone basin for homes and shops
Choose the Mustee 63M for a garage, mudroom or pet-wash corner. Mustee lists (mustee.com) a one-piece 24 × 24 × 10-inch basin molded from Durastone structural fiberglass, an elevated self-draining shelf and removable strainer, and an integral molded-in drain for 3-inch ABS, Schedule 80 PVC or iron pipe, with drain seals available for 2-inch pipe or 3-inch soil pipe. Mustee lists IAPMO cUPC and ANSI Z124 among its certifications and says homeowners use its mop basins in garages, mudrooms, basements and as pet washing areas.
On October 15, 2026, the standard new offer from a third-party seller showed stock with model 63M.
Check Mustee 63M Durastall mop service basin on Amazon →
Zurn Z1996-36: larger basin with mop shelf
Choose the Zurn Z1996-36 when you need more room for buckets, carts or a dog. Zurn’s spec sheet (maker page: files.zurn.com/spec-sheets/z1996-36.pdf) lists a 24 × 36 × 10-inch molded high-density composite basin with an integrally molded, self-draining mop shelf, a PVC drain body, stainless steel strainer and 3-inch gasketed outlet, meeting ANSI Z124.6 with CSA and IAPMO listings. The same option list as the 24-inch basin applies.
On October 15, 2026, the standard new offer sold by Amazon.com showed 18 left with model Z1996-36 in gray.
Check Zurn Z1996-36 mop service basin on Amazon →
Planning the drain
A mop sink drains through the floor, so the drain and trap go under the slab or floor before the basin is set. All three basins here are made for a 3-inch connection: Zurn lists a 3-inch gasketed outlet with pipe reducer options, and Mustee lists a molded-in drain for 3-inch pipe with seals for 2-inch pipe or 3-inch soil pipe. Check which size and material your local code and drain line call for before ordering the seal or reducer.
In a slab, set the drain stub at the right height and location from the basin’s drawing so the gasket can seal. Our trap size by fixture guide covers how trap sizes are set, and our floor drain guide covers floor drain bodies.
The faucet and backflow protection
A mop sink faucet mounts on the wall above the basin, often on 8-inch centers, with a hose thread outlet and a pail hook. Because a hose can end up sitting in dirty water, service sink faucets are commonly sold with a built-in vacuum breaker. Backflow protection is a code matter, so ask your inspector what is required where you are and buy a faucet that meets it.
Run the hot and cold supplies to the wall at the faucet height, and add a hose and bracket and mop hanger if you will hang tools over the basin. Zurn and Mustee both sell these accessories for their basins.
Protecting the walls
Water and mop buckets splash. Stainless wall guards on the two or three walls around the basin protect drywall and make cleanup easy; Zurn lists a 20-gauge Type 304 stainless wall guard option, and Mustee sells accessories too. A bumper guard on the curb protects the basin edge from carts and buckets.
Seal the joint between the basin and the walls with a mildew-resistant sealant, and keep the floor around the basin sloped or protected so water does not run under it.
Mop sink vs utility sink
A mop sink sits on the floor, which makes it easy to dump a heavy bucket or wash a dog without lifting. A utility sink stands at counter height, which is better for washing tools, paint brushes and laundry by hand. If you mostly fill and dump buckets, choose a mop sink; if you mostly wash at the sink, choose a utility sink. See our utility sink guide for laundry tubs and cabinets.
Using a mop sink for pet washing
A floor basin with a 10-inch curb is easy for a dog to step into, which is why Mustee mentions pet washing as a home use. A 24 × 36-inch basin like the Zurn Z1996-36 gives a medium or large dog more room to stand and turn around.
Pet hair clogs drains quickly. Keep the strainer in place, and add a hair catcher over it during baths; our hair catcher guide covers options. A hose with a hand sprayer on the faucet makes rinsing easier, but the same backflow note applies: make sure the faucet has the protection your inspector requires. Use a non-slip mat in the basin so the dog does not slide on the bottom.
Installing a mop basin
Set the basin level and fully supported on a flat floor; follow the maker’s installation instructions for bedding and sealing. Connect the drain gasket to the stub, then test the drain with water before you finish the walls and trim. Our shop vac guide covers vacuums that help with cleanup during the job.
Frequently asked questions
What size is a standard mop sink?
24 × 24 × 10 inches is common; Zurn and Mustee both list that size, and Zurn also offers 24 × 36 inches.
What size drain does a mop sink need?
The basins here connect to a 3-inch drain; Mustee lists seals for 2-inch pipe or 3-inch soil pipe. Follow your local code.
Can I put a mop sink in my house?
Yes. Mustee says homeowners use its mop basins in garages, mudrooms, basements and for pet washing.
Does a mop sink faucet need a vacuum breaker?
Service sink faucets are commonly sold with one; ask your inspector what backflow protection is required.
What are mop sinks made of?
Zurn lists molded high-density composite and Mustee lists Durastone structural fiberglass.
How we chose
This document-based guide makes no hands-on testing claim. We read Zurn’s Z1996-24 and Z1996-36 spec sheets and Mustee’s 63M product page. On October 15, 2026, the two Zurn offers were sold by Amazon.com and the Mustee offer came from a third-party seller; all showed stock. Read our selection method and about Plumbing Picks.
Primary sources
- Zurn Z1996-24 spec sheet (maker page: files.zurn.com/spec-sheets/z1996-24.pdf): size, material, drain body, outlet, weight, certifications, options.
- Mustee 63M mop basin (mustee.com): size, Durastone, shelf, drain connections, certifications, home uses.
- Zurn Z1996-36 spec sheet (maker page: files.zurn.com/spec-sheets/z1996-36.pdf): size, mop shelf, drain, certifications.