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Bronze temperature and pressure relief valve with 3/4 inch NPT connections

Apollo

Apollo 18C402X39 T&P Relief Valve 3/4 Inch Inlet

SKU CH-TFJZ-X214A MPN 18C402X39

Temperature and pressure relief valve with 3/4 inch inlet and outlet, bronze body, factory set at 150 psi and 210°F, auto re-seating design

  • Product typeDrain Components
  • Main materialBronze
  • Temperature and pressure protection for water heaters with 150 psi factory setting
  • Automatic re-seating design restores seal after pressure release without manual intervention
  • Bronze body with stainless steel spring resists corrosion in hot water systems
  • 3/4 inch MNPT inlet and FNPT outlet match standard tank connections
  • Certified to ANSI Z21.22 and ASME HV codes for safety compliance

Relief Valve for Water Heaters

The Apollo 18C402X39 is a temperature and pressure relief valve designed for residential water heating systems. Its bronze body and stainless steel spring resist corrosion in continuous hot water service. The valve protects tanks by discharging water when limits are exceeded.

Factory Set Pressure 150 psi

This valve opens automatically at 150 psi and reseats once pressure drops below that threshold. The 3/4 inch MNPT inlet and FNPT outlet match standard tank tappings. A 3 inch thermostat element senses water temperature directly inside the tank.

Suits Standard Residential Tanks

Installers fitting typical domestic heaters will find the 105,000 BtuH rating and 210 degree F maximum temperature appropriate. Builders working on high capacity commercial vessels or systems requiring a different pressure setting should select an alternative valve.

How it compares

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

Price $45.99
Pricier than about 60% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameApollo
Model name18C402 × 39
Product typeDrain Components
Size & build
Main materialBronze

Questions about this item

What does the 105,000 BtuH rating mean for my water heater?

It indicates the valve can relieve up to 105,000 BtuH of heat input, matching it to tanks with that maximum burner or element capacity.

How do the ANSI Z21.22 and ASME Code HV standards affect installation?

They certify the valve for temperature and pressure relief on residential water heaters, satisfying most local plumbing codes for 150 psi set pressure.

What clearance do I need for the 3-inch thermostat and 7 1/2-inch body height?

Allow at least 3 inches of tank immersion for the thermostat and roughly 7 1/2 inches of vertical space above the 3/4-inch MNPT inlet connection.

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