We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Bronze spring check valve with threaded FNPT connections

Milwaukee Valve

Milwaukee Valve UP548T 1 1/4" Bronze Spring Check Valve

SKU CH-M0WF-TZNYD

Inline spring check valve with bronze body and seat, 1 1/4" FNPT connections, 0.750 to 1.000 psi cracking pressure, rated 250 psi at 150°F and up to 353°F max temperature

  • TypeOther
  • Low-lead bronze body meets potable-water safety
  • Inline spring design provides automatic flow control
  • 750 to 1.000 psi cracking pressure opens with minimal flow
  • Rated 250 psi at 150 °F for reliable service
  • Operates from -20 °F to 353 °F across seasons

1 1/4" Bronze Spring Check Valve

This inline spring check valve is designed for plumbing systems that require automatic back-flow prevention in a horizontal run. The bronze body and bronze seat resist corrosion in potable-water and hydronic applications. Threaded FNPT connections on both ends allow direct installation into 1 1/4 inch pipe without adapters. It is suited for contractors and facility managers maintaining low-lead water distribution networks.

Capacity and pressure headroom

The valve handles water pressure up to 250 psi at 150 degrees F and operates continuously between -20 degrees F and 353 degrees F. A low cracking pressure of .750 to 1.000 psi means the spring opens with minimal flow, preserving headroom for gravity-fed or low-pressure circuits. Steam service is not rated, so the valve must not be used in steam lines or high-temperature condensate returns where pressure or temperature could exceed the stated limits.

Horizontal mounting requirement

This model is rated for horizontal installation only; vertical or angled mounting will prevent the spring from seating correctly and can allow reverse flow. The bronze-on-bronze seal relies on gravity-assisted spring return, so orientation is the single specification that decides whether the valve will function as intended in a given piping layout.

Highlights

  • Low-lead bronze body meets potable-water safety
  • Inline spring design provides automatic flow control
  • 750 to 1.000 psi cracking pressure opens with minimal flow
  • Rated 250 psi at 150 °F for reliable service
  • Operates from -20 °F to 353 °F across seasons

Specifications

BrandMILWAUKEE VALVE
TypeOther

Questions about this item

Will the 0.750 to 1.000 psi cracking pressure work with my existing low-pressure supply lines?

The valve opens between 0.750 and 1.000 psi, so it will function with very low head pressure common in older gravity-fed systems.

How can I confirm the bronze spring check valve is operating correctly after installation?

Verify flow moves only in the arrow direction; the inline spring should close silently when flow stops, with no water hammer or leakage past the bronze seat.

Does the box include pipe sealant or adapters for the 1 1/4" FNPT connections?

Only the valve body with female NPT threads is supplied; thread sealant, pipe nipples or transition fittings must be purchased separately.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.