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Bronze temperature and pressure relief valve with 1/2 inch NPT connections

Apollo

Apollo 18C40129 T&P Relief Valve 1/2 In Trap

SKU CH-Y0MK-ZQ1QH MPN 18C40129

Temperature and pressure relief valve with 1/2 inch inlet and outlet, bronze body, stainless steel spring, factory set at 125 psi and 210 degrees Fahrenheit

  • Product typeDrain Components
  • Protects systems from over-pressure with 125 psi factory setting
  • Prevents dangerous overheating at 210 °F maximum temperature
  • Bronze body resists corrosion for long service life
  • Stainless steel spring ensures reliable auto re-seating after discharge
  • Meets ANSI Z21.22, ASME HV and CSA 4.4 standards

Pressure relief valve for water heaters

The Apollo 18C40129 is a temperature and pressure relief valve designed to protect water-heating systems from excess pressure and overheating. Its bronze body and stainless-steel spring resist corrosion in potable-water service. The valve is factory set to open at 125 psi and 210 degrees Fahrenheit.

Installers meeting code requirements

Plumbing professionals who need a code-compliant T&P valve for standard residential tanks will find this model meets ANSI Z21.22, ASME HV and CSA 4.4. It is not suited for systems that require a higher pressure setting, a larger inlet diameter, or a longer thermostat probe.

Factory-set 125 psi opening pressure

The single specification that decides fitment is the 125 psi relief pressure stamped on the valve. If the water heater or local code calls for a different set pressure, this valve cannot be adjusted and a different model must be selected.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $28.99
Typical for this category: the median of 4,240 items is $31.99.

Specifications

Product
Brand nameApollo
Model name18C40129
Product typeDrain Components

Questions about this item

Will the 15,000 BtuH rating handle my water heater's output?

The valve is rated at 15,000 BtuH, matching water heaters up to that capacity.

Does the bronze body and stainless steel spring stay cool and quiet during continuous operation?

Bronze body and stainless steel spring resist corrosion; the valve opens only at 125 psi or 210 °F, so it stays closed and silent under normal conditions.

My tank has a 1/2 inch NPT female port — will this valve thread straight in?

Yes, the valve has a 1/2 inch MNPT inlet that threads directly into a 1/2 inch FNPT tank opening.

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