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Bronze float valve with horizontal pipe mount and brass rod

Watts

Watts ST375 Float Valve 3/8 in Bronze Pipe Mount bathware

SKU CH-A7D7-DDDJC

Bronze float valve with threaded outlet mounts on horizontal piping, delivers 14 gpm at 50 psi and 21 gpm at 100 psi, rated to 125 psi and 180 °F

  • Size3/8"
  • TypeOther
  • Reliable water control with 125 psi maximum pressure rating
  • Consistent fill performance delivering 14 gpm at 50 psi supply pressure
  • Higher capacity at 100 psi providing 21 gpm flow rate
  • Durable bronze construction withstands temperatures up to 180 Degrees F
  • Secure installation using 10 inch brass rod with 1/4-20 threading

Float Valve for Horizontal Piping

The Watts ST375 is a bronze float valve designed for horizontal pipe mounting with a 3/8 in NPSM connection. It suits plumbing systems that require automatic liquid-level control in tanks or cisterns. The valve body and internal components are bronze, while the operating rod is brass with a 1/4 in.-20 thread and a length of 10 in. No float is included with this assembly.

Flow Limits at Rated Pressures

At 50 psi inlet pressure the valve delivers 14 gpm, and at 100 psi it delivers 21 gpm. The maximum working pressure is 125 psi, so the valve must not be installed where supply pressure can exceed this figure. The maximum service temperature is 180 degrees F, which limits use to standard hot-water temperatures below boiling.

Check Supply Pressure and Thread Compatibility

Before ordering, verify that the supply pressure stays at or below 125 psi and that the system temperature will not exceed 180 degrees F. Confirm the existing piping uses a 3/8 in NPSM thread to match the valve inlet. Ensure the 1/4 in.-20 rod thread is compatible with the float or lever mechanism you intend to attach. This product contains chemicals listed under California Proposition 65.

Highlights

  • Reliable water control with 125 psi maximum pressure rating
  • Consistent fill performance delivering 14 gpm at 50 psi supply pressure
  • Higher capacity at 100 psi providing 21 gpm flow rate
  • Durable bronze construction withstands temperatures up to 180 Degrees F
  • Secure installation using 10 inch brass rod with 1/4-20 threading

Specifications

BrandWATTS
Size3/8"
TypeOther

Questions about this item

Which size should I choose for a 3/8 inch NPSM horizontal pipe mount?

This valve is a single 3/8 inch NPSM model designed for horizontal piping, so no alternative sizes are offered for this specific configuration.

What do the 14 gpm at 50 psi and 21 gpm at 100 psi flow figures mean for my cistern fill rate?

At typical mains pressure of 50 psi the valve delivers 14 gallons per minute; at 100 psi it rises to 21 gallons per minute, giving faster tank refill when supply pressure is higher.

How does the NPSM connection and 125 psi maximum pressure limit installation choices?

The valve uses a 3/8 inch NPSM threaded outlet for horizontal pipe mounting and is rated to a maximum working pressure of 125 psi, so supply pressure must stay at or below that level.

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