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Temperature & Pressure Relief Valves
Lead Content Warning
Do not use this item for any installation or repair of potable water applications. This product does not comply with the "Safe Drinking Water Act," which requires that products meet low-lead standards in order to be used in systems providing water for human consumption (drinking or cooking). This item is for non-potable (non-human consumption) water applications only.
Lead Content Warning
This product does not comply with the Safe Drinking Water Act, which requires that products used in any system providing water for human consumption (drinking or cooking) to meet low-lead standards. Please check the box below to confirm you are aware that this item is for non-potable water applications only.
You must agree to this statement in order to purchase this product.
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Add to ListAdd to List3/4" NCLX-5L Domestic T&P Relief Valve 18821-0150 3/4" NCLX-5L Domestic T&P Relief ValveSKU: 18821-0150Brand: Cash-Acme
(1)Add to List -
Add to ListAdd to ListLF100XL-4 3/4" Lead Free Self Closing T & P Relief Valve 0556000 LF100XL-4 3/4" Lead Free Self Closing T & P Relief ValveSKU: 0556000Brand: Watts(6)Add to List -
Add to ListAdd to ListLF100XL-8, 3/4" Lead Free T & P Relief Valve 0556001 LF100XL-8, 3/4" Lead Free T & P Relief ValveSKU: 0556001Brand: Watts(3)Add to List -
![3/4" 40XL-5 Lead Free T&P Relief Valve (150 psi) Product Image]()
Add to ListAdd to List3/4" 40XL-5 Lead Free T&P Relief Valve (150 psi) 0556016 3/4" 40XL-5 Lead Free T&P Relief Valve (150 psi)SKU: 0556016Brand: Watts(6)Add to List -
![1" 40XL-4 Lead Free T&P Relief Valve (150 psi) Product Image]()
Add to ListAdd to List1" 40XL-4 Lead Free T&P Relief Valve (150 psi) 0556008 1" 40XL-4 Lead Free T&P Relief Valve (150 psi)SKU: 0556008Brand: Watts(2)Add to List -
![LFLL100XL, 3/4" Lead<br>Free Extended Shank<br>T & P Relief Valve Product Image]()
Add to ListAdd to ListLFLL100XL, 3/4" Lead Free Extended Shank T & P Relief Valve 0556002 LFLL100XL, 3/4" Lead Free Extended Shank T & P Relief ValveSKU: 0556002Brand: Watts(1)Add to List -
![3/4" NCLX-5 Domestic T&P Relief Valve, Lead Free Product Image]()
Add to ListAdd to List3/4" NCLX-5 Domestic T&P Relief Valve, Lead Free 23261-0150 3/4" NCLX-5 Domestic T&P Relief Valve, Lead FreeSKU: 23261-0150Brand: Cash-Acme(1)Add to List -
![1/2" LF1XL-4 T&P Relief Valve, Lead Free (150 psi) Product Image]()
Add to ListAdd to List1/2" LF1XL-4 T&P Relief Valve, Lead Free (150 psi) 0121325 1/2" LF1XL-4 T&P Relief Valve, Lead Free (150 psi)SKU: 0121325Brand: Watts(11)Add to List -
![3/4" NCLX-1 Domestic T&P Relief Valve, Lead Free <br>(1" Element) Product Image]()
Add to ListAdd to List3/4" NCLX-1 Domestic T&P Relief Valve, Lead Free (1" Element) 23279-0150 3/4" NCLX-1 Domestic T&P Relief Valve, Lead Free (1" Element)SKU: 23279-0150Brand: Cash-Acme(1)Add to List -
![3/4" 40XL-5 T&P Relief Valve (150 psi) Product Image]()
Add to ListAdd to List3/4" 40XL-5 T&P Relief Valve (150 psi) 0156731 3/4" 40XL-5 T&P Relief Valve (150 psi)![Contains Lead]()
SKU: 0156731Brand: Watts(6)Add to List -
![3/4" FVMX-5C Commercial T&P Relief Valve<br>(Male Inlet) Product Image]()
Add to ListAdd to List3/4" FVMX-5C Commercial T&P Relief Valve (Male Inlet) 16934-0150 3/4" FVMX-5C Commercial T&P Relief Valve (Male Inlet)![Contains Lead]()
SKU: 16934-0150Brand: Cash-AcmeAdd to List -
![LFL100XL3M7, 3/4" Lead<br>Free Extended Shank<br>T & P Relief Valve Product Image]()
Add to ListAdd to ListLFL100XL3M7, 3/4" Lead Free Extended Shank T & P Relief Valve 0556003 LFL100XL3M7, 3/4" Lead Free Extended Shank T & P Relief ValveSKU: 0556003Brand: Watts(1)Add to List -
![3/4" x 1" F-95 Commercial T&P Relief Valve (Female Inlet) Product Image]()
Add to ListAdd to List3/4" x 1" F-95 Commercial T&P Relief Valve (Female Inlet) 19497-0050 3/4" x 1" F-95 Commercial T&P Relief Valve (Female Inlet)![Contains Lead]()
SKU: 19497-0050Brand: Cash-Acme(1)Add to List -
![LF100XL 3/4" Lead Free<br>T & P Relief Valve<br>(175 PSI, 210 F) Product Image]()
Add to ListAdd to ListLF100XL 3/4" Lead Free T & P Relief Valve (175 PSI, 210 F) 0121344 LF100XL 3/4" Lead Free T & P Relief Valve (175 PSI, 210 F)SKU: 0121344Brand: Watts(1)Add to List -
![1" LF40XL-7 Lead Free T&P Relief Valve (150 psi) Product Image]()
Add to ListAdd to List1" LF40XL-7 Lead Free T&P Relief Valve (150 psi) 0121428 1" LF40XL-7 Lead Free T&P Relief Valve (150 psi)SKU: 0121428Brand: WattsAdd to List -
![3/4" NCLX-LS Domestic T&P Relief Valve Product Image]()
Add to ListAdd to List3/4" NCLX-LS Domestic T&P Relief Valve 19084-0150 3/4" NCLX-LS Domestic T&P Relief ValveSKU: 19084-0150Brand: Cash-AcmeAdd to List -
![3/4" FVX-5C Commercial T&P Relief Valve (Female Inlet) Product Image]()
Add to ListAdd to List3/4" FVX-5C Commercial T&P Relief Valve (Female Inlet) 16931-0150 3/4" FVX-5C Commercial T&P Relief Valve (Female Inlet)![Contains Lead]()
SKU: 16931-0150Brand: Cash-AcmeAdd to List -
![3/4" NCLX-5LX Domestic T&P Relief Valve (Male Inlet) Product Image]()
Add to ListAdd to List3/4" NCLX-5LX Domestic T&P Relief Valve (Male Inlet) 19783-0150 3/4" NCLX-5LX Domestic T&P Relief Valve (Male Inlet)![Contains Lead]()
SKU: 19783-0150Brand: Cash-Acme(1)Add to List -
![3/4" 40XL-8 Lead Free T&P Relief Valve (150 psi) Product Image]()
Add to ListAdd to List3/4" 40XL-8 Lead Free T&P Relief Valve (150 psi) 0121421 3/4" 40XL-8 Lead Free T&P Relief Valve (150 psi)SKU: 0121421Brand: WattsAdd to List -
![1" FVMX-4LS Commercial T&P Relief Valve (Male Inlet) Product Image]()
Add to ListAdd to List1" FVMX-4LS Commercial T&P Relief Valve (Male Inlet) 22894-0150 1" FVMX-4LS Commercial T&P Relief Valve (Male Inlet)![Contains Lead]()
SKU: 22894-0150Brand: Cash-Acme(1)Add to List -
![3/4" FVMX-8C Commercial T&P Relief Valve, Lead Free (Male Inlet) Product Image]()
Add to ListAdd to List3/4" FVMX-8C Commercial T&P Relief Valve, Lead Free (Male Inlet) 23275-0150 3/4" FVMX-8C Commercial T&P Relief Valve, Lead Free (Male Inlet)SKU: 23275-0150Brand: Cash-AcmeAdd to List -
![100XL8-100210 3/4" Temperature & Pressure Relief Valve Product Image]()
Add to ListAdd to List100XL8-100210 3/4" Temperature & Pressure Relief Valve 0066123 100XL8-100210 3/4" Temperature & Pressure Relief ValveSKU: 0066123Brand: WattsAdd to List -
![3/4" FVMX-5C Commercial T&P Relief Valve, Lead Free (Male Inlet) Product Image]()
Add to ListAdd to List3/4" FVMX-5C Commercial T&P Relief Valve, Lead Free (Male Inlet) 23255-0150 3/4" FVMX-5C Commercial T&P Relief Valve, Lead Free (Male Inlet)SKU: 23255-0150Brand: Cash-AcmeAdd to List -
![3/4" FVX-5C Commercial T&P Relief Valve, Lead Free (Female Inlet) Product Image]()
Add to ListAdd to List3/4" FVX-5C Commercial T&P Relief Valve, Lead Free (Female Inlet) 23256-0150 3/4" FVX-5C Commercial T&P Relief Valve, Lead Free (Female Inlet)SKU: 23256-0150Brand: Cash-Acme(1)Add to List -
![3/4" LF10L-2, T & P Relief Valve, Lead Free - 150 psi Product Image]()
Add to ListAdd to List3/4" LF10L-2, T & P Relief Valve, Lead Free - 150 psi 0121339 3/4" LF10L-2, T & P Relief Valve, Lead Free - 150 psiSKU: 0121339Brand: WattsAdd to List -
![1" FVX-5L Commercial T&P Relief Valve (Female Inlet) Product Image]()
Add to ListAdd to List1" FVX-5L Commercial T&P Relief Valve (Female Inlet) 15638-0150 1" FVX-5L Commercial T&P Relief Valve (Female Inlet)SKU: 15638-0150Brand: Cash-AcmeAdd to List -
![1" FVMX-5C Commercial T&P Relief Valve Product Image]()
Add to ListAdd to List1" FVMX-5C Commercial T&P Relief Valve 16939-0150 1" FVMX-5C Commercial T&P Relief Valve![Contains Lead]()
SKU: 16939-0150Brand: Cash-Acme(2)Add to List -
![1" FVMX-3C Commercial T&P Relief Vlv, Lead Free (Male Inlet) Product Image]()
Add to ListAdd to List1" FVMX-3C Commercial T&P Relief Vlv, Lead Free (Male Inlet) 23253-0150 1" FVMX-3C Commercial T&P Relief Vlv, Lead Free (Male Inlet)SKU: 23253-0150Brand: Cash-AcmeAdd to List -
![LF100XL-Z11 3/4" Lead Free T & P Relief Valve (100 PSI, 180 F) Product Image]()
Add to ListAdd to ListLF100XL-Z11 3/4" Lead Free T & P Relief Valve (100 PSI, 180 F) 0121357 LF100XL-Z11 3/4" Lead Free T & P Relief Valve (100 PSI, 180 F)SKU: 0121357Brand: WattsAdd to List -
![1" Lead Free N240X6 <br>T&P Relief Valve Product Image]()
Add to ListAdd to List1" Lead Free N240X6 T&P Relief Valve 0556019 1" Lead Free N240X6 T&P Relief ValveSKU: 0556019Brand: WattsAdd to List
Resources
Articles
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More Info
A Temperature and Pressure (T & P) relief valve is the primary "back-up" safety device that prevents water in a pressurized hot water heater from overheating. A T & P relief valve is a two-in-one safety device, which responds both to excessive temperature and to excessive pressure in a water heater. If a system exceeds its temperature/pressure limit, a water heater or pipe will burst, making the proper installation of a T&P relief valve essential.
How does it work?
A T & P valve responds to excessive temperature by expansion of the thermostat. This lifts the disc off its seat and discharges overheated water. As overheated water exits the tank it is replaced by cool water. This process regulates the water temperature in a hot water heater. Typically, when a valve is relieving water in volume, it is due to excessive temperature.
The valve also responds to excessive pressure by discharging water to prevent further pressure increase. When water is heated in a closed system, it expands and causes an increase in pressure. This is called thermal expansion. When the system is opened, pressure will return to normal, and the relief valve will stop dripping. When a backflow prevention device or check valve is installed on the water service entering a building, a closed system is created. When water is heated, it expands. Because the water has nowhere to go in a closed system, a potentially dangerous situation is created, and a T&P relief valve must be installed. If a T & P valve is dripping, rather than relieving in volume, the valve is prevented from closing tightly. A dripping valve usually indicates either thermal expansion or debris on the seat.
T & P relief valves may be constructed of bronze or cast iron. To select the proper T & P relief valve a system's capacity, pressure, and temperature requirements must be determined. We offer a wide selection of Bell & Gossett, Watts, Zurn - Wilkins, McDonnell & Miller, and Cash - Acme relief valves to protect your heating system.
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