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Bronze temperature and pressure relief valve with MNPT inlet and FNPT outlet

Apollo

Apollo 18C5115125 T&P Relief Valve trap MNPT×FNPT 125 psi 210°F

SKU CH-58D2-BC0EF MPN 18C5115125

Temperature and pressure relief valve with MNPT inlet and FNPT outlet, factory set at 125 psi and 210°F, bronze body with stainless steel spring

  • TypeDrain Components
  • Factory-set 125 psi pressure protects water heaters from over-pressurisation
  • Automatic re-seating restores normal operation after pressure relief
  • Bronze body with stainless-steel spring resists corrosion in hot-water systems
  • Rated to 210 °F and 205 000 BtuH for high-capacity installations
  • Certified to ANSI Z21.22, ASME HV and CSA standards

Bronze T&P Relief Valve

This bronze temperature and pressure relief valve protects water heaters and storage tanks from excess pressure and temperature. It features a factory-set pressure of 125 psi and a maximum temperature rating of 210 degrees Fahrenheit. The valve uses MNPT inlet and FNPT outlet connections, both sized at 3/4 inch. Automatic re-seating allows the valve to close after pressure normalises.

Suitable for standard tank protection

This valve suits residential and light-commercial water heaters requiring ASME Code HV and ANSI Z21.22 compliance. It is not intended for high-capacity commercial boilers needing pressure settings above 125 psi. Installers needing a non-reclosing or manually operated relief device should select a different valve type. Systems requiring stainless-steel body construction are not served by this bronze model.

125 psi factory pressure setting

The single specification that decides fitment is the 125 psi factory pressure setting matched to the vessel nameplate rating. The 205,000 BtuH capacity and 3/4 inch MNPT by FNPT connections must also align with the tank tapping and input rating. Verify the 5 inch thermostat length reaches the tank water volume before purchase.

Highlights

  • Factory-set 125 psi pressure protects water heaters from over-pressurisation
  • Automatic re-seating restores normal operation after pressure relief
  • Bronze body with stainless-steel spring resists corrosion in hot-water systems
  • Rated to 210 °F and 205 000 BtuH for high-capacity installations
  • Certified to ANSI Z21.22, ASME HV and CSA standards

Specifications

TypeDrain Components
BrandApollo
Model18C5115125

Questions about this item

At what pressure does the 125 psi factory setting start to relieve?

The valve opens at its 125 psi factory set pressure and automatically re-seats once pressure drops below that level.

How hot does the bronze body get when the valve cycles at the 210°F limit?

The bronze body and stainless-steel spring are rated for continuous operation up to the 210°F maximum temperature.

Which pipe threads must the existing system have to accept the MNPT inlet and FNPT outlet?

The inlet is 3/4 inch MNPT and the outlet is 3/4 inch FNPT, matching standard NPT plumbing connections.

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