Faucet Parts & Repair Products
The faucet parts in this category are organized into six functional groups. Each group below explains what the parts do and where they install.
Valve Components
Valve components are the water faucet components that regulate flow and temperature. Faucet Cartridges & Parts serve single-handle and two-handle cartridge valves. Stems & Extensions serve compression and quarter-turn valves, and Seats & Springs seal against them. Bonnets secure the stem, and Diverters & Parts channel water between spout, sprayer, and shower.
Seals and Repair Kits
Seals stop leaks at moving and stationary joints. Faucet Washers & O-rings include flat, beveled, and bibb washers, plus O-rings for spouts and stems. Faucet repair kits bundle the seats, springs, washers, and O-rings a specific valve needs, which keeps the replacement set matched to one faucet model.
Handles, Trim, and Extensions
Handle Kits and Buttons & Screws secure the handle to the stem broach. Adapters & Trim Kits fit new trim to an existing valve. Escutcheons cover the wall or deck opening, Escutcheon Nipples support them at depth, and Extension Tubes & Extension Kits cover added stem length on deep-set valves.
Spouts, Aerators, and Spray Components
Spouts & Spout Kits replace worn outlets, including the O-rings that seal swivel spouts. Faucet Aerators mix air into the stream, limit flow rate, and screen debris. Wand Kits and Hoses & Hose Kits restore pull-down and pull-out kitchen sprayers, where hoses wear at the guide and connection points.
Mounting and Specialty Hardware
Deck Plates and Hole Covers close unused sink or countertop holes when a new faucet uses fewer holes or a different spread. Faucet Hardware covers mounting nuts, brackets, and clips. Pop-up Rods & Parts connect lavatory faucets to the drain stopper. Other Faucet Parts hold specialty faucet replacement components.
Supply Connections
Risers & Supply Unions connect the faucet shank or tailpiece to the water supply under the sink. Faucet Stop Valve & Supply Kits pair a shutoff valve with a supply line, which isolates the fixture for service. These faucet plumbing parts complete the connection to the supply piping.
How Faucet Parts Work and Where They Install
Compression and Washerless Valves
Compression faucets close by pressing a stem washer against a seat, so drips usually trace to the washer or seat. Washerless faucets use a cartridge, ball, or ceramic disc to regulate flow, and leaks trace to the cartridge, O-rings, or seats and springs.
Commercial and Institutional Fixtures
Restrooms, commercial kitchens, hotels, and schools put high cycle counts on faucet valves and handles. In these settings, faucet maintenance parts such as cartridges, aerators, and seals are often replaced on a schedule, which limits unplanned fixture shutdowns in high-traffic areas.
Outdoor and Utility Faucets
Outdoor spigots and hose bibbs use compression stems, washers, and packing that wear with freeze cycles and frequent hose use. Utility and laundry sink faucets typically use two-handle compression or cartridge valves, so the same stem, washer, and handle groups apply to them.
Key Specifications and Planning Steps
Stem and Cartridge Sizing
Match a stem or cartridge by faucet manufacturer and model first. When the model is unknown, compare the removed part directly: overall length, broach (spline) count and shape at the handle end, and the thread or seat end.
Threads and Connections
Aerators thread onto the spout as male or female; common sizes are 15/16 in.-27 male and 55/64 in.-27 female. Supply lines typically connect a 3/8 in. compression stop outlet to the faucet connection.
Materials and Lead-Free Requirements
Under the federal Safe Drinking Water Act, parts in the drinking water path must meet the lead-free limit of 0.25% weighted average lead on wetted surfaces. Handles, escutcheons, and deck plates do not contact water.
Planning Steps
Close the supply stops, open the faucet to relieve pressure, and note the brand and model. Remove the worn part, match it, and gather faucet repair supplies such as plumber's grease and PTFE tape.
Choosing the Right Faucet Parts
Start with the symptom and the valve type, then confirm fit by manufacturer and model. Use individual parts when a single seal or stem has failed, and use a matched repair kit when several wear components have aged together. Faucet repair and replacement decisions depend on the valve body: if the body is cracked, corroded at the seat, or the faucet is discontinued with no parts support, replacing the fixture is usually more practical than repeated repairs. For commercial sites, standardizing on fewer faucet models simplifies stocking faucet parts and shortens service calls.
Frequently Asked Questions
Where can I buy faucet parts for commercial restroom and kitchen faucets in the US?
Plumbing supply distributors and trade counters across the US stock faucet parts for commercial restroom and kitchen faucets, including cartridges, stems, seals, aerators, and supply kits. Bring the faucet manufacturer, model number, or the removed part to confirm fit before ordering.
What faucet replacement parts should a maintenance tech keep on the truck?
A practical service stock of faucet replacement parts includes cartridges and stems for the faucet models on site; assorted flat and beveled washers, O-rings, and seats and springs; aerators in standard thread sizes; handle screws, plumber's grease, and PTFE tape; and supply lines and a few stop valves for connection failures.
Should I repair or replace a leaking commercial faucet?
Repair the faucet when the leak traces to a replaceable cartridge, stem, seat, or seal and the valve body is sound. Replace it when the body is cracked, the seat is corroded and not replaceable, or the model is discontinued with no parts support. Weigh faucet repair and replacement against labor time and downtime at the site.
What is the difference between a faucet cartridge, a stem, and a ball assembly?
A stem is a threaded shaft in a compression valve that presses a washer against a seat. A cartridge is a self-contained valve unit that regulates flow and, in single-handle faucets, temperature. A ball assembly is a slotted ball that rotates in the faucet body to mix hot and cold water, sealed by rubber seats and springs.
Is a faucet repair kit better than buying individual washers and O-rings?
Faucet repair kits work better when several wear parts have aged together, because the kit supplies matched seats, springs, washers, and O-rings for one valve. Individual washers and O-rings cost less when a single seal has failed and the rest of the valve is in good condition.
What faucet repair parts do I need to fix a dripping two-handle compression faucet?
Start with the stem washer and seat on the leaking side, which are the most common faucet repair parts for this repair. Replace the washer, and replace the seat if it is pitted or worn. Replace the stem if its threads or packing are worn. Match each part to the faucet manufacturer and model.
Why does my faucet have low water flow, and which parts should I check first?
Check these in order: a clogged aerator, a partly closed or failing supply stop, a kinked or restricted supply line, debris in the cartridge or valve body, and a worn cartridge. Cleaning or replacing the aerator resolves many cases. If flow stays low, move on to the supply side and the cartridge.
How do I identify the right replacement cartridge or stem for an older faucet?
Find the manufacturer and model from markings on the faucet body, handle, or escutcheon. If there are none, remove the part and compare its overall length, broach count and shape, and thread or seat end against manufacturer data or a stem chart. Universal stems and cartridges fit many common designs.
What causes a kitchen faucet sprayer or pull-down wand to stop working?
Common causes are a failed diverter, a clogged spray head or aerator screen, a kinked or worn hose, and a loose hose connection. Diverter parts, hoses and hose kits, and wand kits restore pull-down and side-spray function.
How do I fix a leak at the base of a faucet spout?
On swivel spouts, worn spout O-rings usually cause leaks at the base. Remove the spout, replace the O-rings, and apply plumber's grease before reinstalling. If the leak continues, check the cartridge and bonnet, or replace the spout with a spout kit.
Which faucet parts cover extra sink holes or mismatched faucet spacing during a replacement?
Deck plates cover unused holes when a single-hole faucet replaces a 4 in. or 8 in. spread faucet. Hole covers close individual holes, such as an old sprayer or soap dispenser hole. Escutcheons cover openings around the faucet body or valve trim.
When do I need a stem extension or extension tube for a tub or shower valve set too deep in the wall?
You need one when the valve sits too deep for the stem to reach the handle at the finished wall. A stem extension lengthens the stem so the handle can engage it, an extension tube or sleeve covers the added length, and an escutcheon nipple supports the escutcheon at the new wall depth.
What replacement parts are available for outdoor spigots and hose bibbs?
Replacement parts for outdoor spigots and hose bibbs include stems, washers, bibb screws, seats, packing, and handles. Frost-free hose bibbs use longer stems that close the valve inside the heated wall, so match the stem length to the model.
Which faucet replacement parts have to meet lead-free requirements for drinking water in the US?
Parts that contact drinking water must meet the federal lead-free limit of 0.25% weighted average lead on wetted surfaces. These include cartridges, stems, seats, aerators, spouts, and supply connectors. Parts that do not contact water fall outside that requirement, such as handles, buttons, escutcheons, deck plates, and hole covers. Check each manufacturer's certification listing for the specific part.
What faucet plumbing parts connect a faucet to the water supply under the sink?
The connection uses three faucet plumbing parts: a shutoff stop valve on the supply pipe, a supply line or riser from the stop to the faucet connection, and, in some installations, a supply union or adapter at the faucet shank. Stop valve and supply kits bundle the valve and line together.
