Plumbing Valves

A valve can have the right 1/2-inch size and still be wrong for the job. The connection may not match the pipe, the body may not suit the fluid, or the pressure and temperature ratings may fall short of the system requirements.

DK Hardware carries plumbing valves for fixture shutoff, branch isolation, flow control, pressure regulation, pump discharge, backflow protection, water heating, irrigation, and repair work. Start with what the valve must do, then confirm the pipe size, connection at each end, material, pressure, temperature, and required approvals before ordering.

Which Plumbing Valve Do You Need?

Valve Type	Common Uses	Check Before Ordering
Ball valves	Main and branch isolation, equipment shutoff, water and approved process lines	Full or reduced port, connection type, pressure and temperature ratings
Gate valves	Full-open or full-closed isolation where a gate valve is specified	Rising or non-rising stem, body material, end connections
Stop valves	Local shutoff at sinks, toilets, appliances, and supply risers	Angle or straight body, inlet size, outlet size, quarter-turn or multi-turn operation
Check valves	Pump discharge, sump lines, boiler feeds, and other one-way flow applications	Flow direction, spring or swing design, orientation, cracking pressure
Backflow preventer valves	Approved cross-connection protection for potable-water systems	Hazard type, backpressure or backsiphonage protection, approvals, testing requirements
Vacuum breakers and backflow breakers	Hose outlets, irrigation, and applications exposed to backsiphonage	Continuous-pressure rating, installation height, orientation, local code
Pressure-reducing valves	Reducing high supply pressure to a controlled downstream range	Maximum inlet pressure, adjustable outlet range, pipe size, bypass feature
Hose bibbs and sillcocks	Exterior hose connections, utility rooms, and wash-down points	Inlet connection, wall thickness, frost-free length, anti-siphon protection
Bathtub and shower valves	Mixing hot and cold water and controlling shower flow	Rough-in body, trim series, pressure-balance or thermostatic function

Comparing Plumbing Ball Valve and Shut Off Valve

A plumbing ball valve uses a quarter-turn handle to open or close the flow path. Ball valves are commonly selected for full-open or full-closed service because they operate quickly and are available with threaded, sweat, PEX, push-to-connect, compression, and solvent-weld ends.

A plumbing shut off valve may refer to a ball valve, gate valve, straight stop, angle stop, or another valve used to isolate part of a water system. Match the valve to its location and connection:

Use an angle stop when the supply line turns 90 degrees toward a fixture.
Use a straight stop when the inlet and outlet follow the same direction.
Check available handle clearance before choosing a lever, tee handle, or handwheel.
Confirm whether the valve is intended for frequent operation or occasional isolation.

Gate valves are designed for full-open or full-closed service and are not intended for routine throttling. When replacing one, match the connection, size, stem arrangement, pressure class, and application listed for the existing valve.

Comparing Brass, Bronze, PVC, CPVC and Stainless Steel Valves

Valve body material affects fluid compatibility, temperature range, corrosion resistance, pressure capacity, and approved use.

Brass and bronze valves are common in water distribution, fixture supplies, hydronic systems, and commercial piping. Check the alloy, seat material, service rating, and potable-water certification when required.
PVC valves serve many cold-water, irrigation, pool, and non-potable systems. Potable-water use depends on certification and local code.
CPVC valves support higher water temperatures than many PVC products, but the listed temperature and pressure still control use.
Stainless steel valves may suit corrosive service when the steel grade, seals, fluid, and operating conditions are compatible.

Material name alone does not establish working pressure or approved service.

Comparing Plumbing Check Valves and Backflow Protection

A plumbing check valve allows flow in one direction and closes when flow reverses. Spring, swing, lift, and ball designs have different orientation and operating requirements.

A plumbing backflow valve or backflow-prevention assembly protects potable water at a cross-connection. Selection depends on backsiphonage, backpressure, continuous pressure, and the degree of hazard.

Device	Main Purpose	Important Limitation
Plumbing check valve	Maintains one-way flow in approved piping or equipment	A standard check valve is not automatically approved as cross-connection protection
Hose-bibb vacuum breaker	Protects a hose-thread outlet from backsiphonage	Confirm whether continuous pressure is permitted
Atmospheric vacuum breaker	Protects against backsiphonage in approved applications	Not used for backpressure or continuous-pressure service
Pressure vacuum breaker	Protects against backsiphonage under continuous supply pressure	Does not protect against backpressure and requires approved placement
Double-check or reduced-pressure assembly	Provides specified cross-connection protection	Selection, installation, testing, and service access may be regulated locally

For an inspected installation, follow the project specification and local plumbing authority. Confirm the device standard, testing, orientation, drainage, freeze protection, and service access.

Potable-Water and Lead-Free Requirements

Products used in covered drinking-water applications must meet applicable lead-free requirements. In the United States, lead free generally means no more than 0.25% weighted average lead content across wetted surfaces for covered products.

Check the product page or manufacturer documentation for required certification. Some valves are made only for irrigation, industrial, pool, gas, or other non-potable service.

Replacing an Existing Plumbing Valve

Before removing the old valve, record:

Manufacturer and part or series number
Valve function, nominal size, and both end connections
Pipe or tube material
Pressure, temperature, and approval markings
Handle clearance, orientation, and flow-direction arrow

Photos of the valve body, markings, connections, and surrounding pipe can help when the original part number is incomplete.

Plumbing Valve FAQs

Is a Ball Valve Better Than a Gate Valve?

A plumbing ball valve offers a quick quarter-turn shutoff. A gate valve may be required by an existing design or project specification. Compare the service, connections, ratings, and available space.

Which Plumbing Shut Off Valve Works on PEX?

Select a valve designed with PEX barb, crimp, or push-fit ends. Options include SharkBite 1/2-inch barb ball valves with drains, Apollo 1/2-inch PEX barb tee-handle valves, and Dahl crimp-by-compression stops rated at 250 psi.

Can a PVC Plumbing Valve Be Used for Drinking Water?

Only when the specific valve is certified for potable-water use, suitable for the operating temperature and pressure, and permitted by local code. The material name by itself is not enough.

What Does Full Port Mean on a Plumbing Ball Valve?

Full port means the valve has a larger internal passage than a reduced-port valve of the same nominal size. Check the published bore or flow data when system performance matters.

How Do I Match a Plumbing Shower Valve?

Identify the rough-in valve manufacturer and series before choosing replacement cartridges, trim, handles, or control parts. A trim set that looks similar may not fit another rough-in body, even when both come from the same manufacturer.

What Is an Angle Valve Used For?

An angle valve redirects water flow at a 90-degree angle to provide a local shut off right at the fixture. You will find these installed beneath sinks and behind toilets and they sit with the straight stops in supply stops and valves.

Shop Plumbing Valves at DK Hardware

Browse Plumbing Valves for ball, gate, check, stop, pressure-reducing, backflow, shower, float, relief, and specialty valves, along with valve parts and repair components. Compare function, size, end connections, material, ratings, approvals, and package quantity before ordering.

Contractors, maintenance teams, and project buyers can request volume pricing for larger orders. For help matching a replacement, contact us with the manufacturer number, valve markings, connection details, application, and photos of the existing installation. Related pipe, fittings, repair parts, and fixture supplies are available in the plumbing.

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