Spirax Sarco Liquid Expansion Trap, Bydrain, 1/2 in Nominal, NPT, 145 psig, Stainless Steel, 158 deg F, 1.7 in W x 4.3 in H

The Spirax Sarco bydrain freeze protection liquid expansion trap is made of stainless steel. It has been specifically designed for protecting condensate systems from frost damage. This fixed temperature discharge trap continuously monitors the temperature in the pipes; the trap is firmly closed at 45 deg F, but as the temperature of the liquid cools to 36 deg F the trap opens, discharging any liquid in the pipe.