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 Y-pattern swing check valve with sweat connections

Milwaukee Valve

Milwaukee Valve 1509Y 1-1/4" Bronze Swing Y Check Valve

SKU CH-ZZ70-7QBAX

Bronze Y-pattern swing check valve with sweat connections for 1-1/4" pipe, rated to 300 psi at 150°F and operational from -20°F to 425°F

  • Size1 1/4"
  • TypeOther
  • Prevents backflow with Y-pattern swing design
  • Bronze body resists corrosion in water systems
  • Sweat connections suit copper piping installations
  • Rated 300 psi at 150 °F for high-pressure lines
  • Operates from -20 °F to 425 °F across seasons

1-1/4" Bronze Swing Y Check Valve

The Milwaukee Valve 1509Y is a bronze swing Y check valve with a 1-1/4 inch sweat connection. It allows flow in one direction while automatically preventing backflow in residential and commercial plumbing systems. The Y-pattern body design provides a straight-through flow path with reduced pressure drop compared to standard swing check valves. This valve suits horizontal or vertical mounting orientations.

Replacing a basic swing check

Install this valve when a simple gravity-closed flap is insufficient and a Y-pattern bronze body is required for the piping layout. The 0.5 psi cracking pressure opens with minimal flow, making the upgrade worthwhile on low-head systems where a heavier disc would stay shut. It handles water pressure up to 300 psi at 150 degrees Fahrenheit and temperatures from -20 to 425 degrees Fahrenheit. Buyers who need a lift-check mechanism or a different connection type should look elsewhere.

Sweat installation with bronze-to-bronze sealing

Sweat the valve into copper tubing using standard brazing techniques; the bronze body and bronze seal mate directly without a separate gasket. Ensure the piping is clean and properly supported so the valve body does not carry pipe weight. The most common issue is debris preventing the swing disc from seating fully, which causes leakage. Flush the line thoroughly before final pressure testing.

Highlights

  • Prevents backflow with Y-pattern swing design
  • Bronze body resists corrosion in water systems
  • Sweat connections suit copper piping installations
  • Rated 300 psi at 150 °F for high-pressure lines
  • Operates from -20 °F to 425 °F across seasons

Specifications

BrandMILWAUKEE VALVE
Size1 1/4"
TypeOther

Questions about this item

What size copper pipe does the 1-1/4 inch sweat connection require?

The valve uses a 1-1/4 inch sweat-by-sweat connection, so it joins directly to 1-1/4 inch copper tubing with solder.

Can the 1509Y be mounted vertically, and which way must the flow arrow point?

Yes, the valve is rated for horizontal or vertical mounting; install it with the flow arrow pointing in the direction of system flow so the bronze disc can swing freely.

How often should the bronze seat and disc be inspected or replaced in a 300 psi hot-water system?

Inspect the bronze seat and disc annually; replace them if wear or leakage appears, especially when operating near the 300 psi rating at 150 °F.

Also in this aisle

People compared these

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