Spirax Sarco Self Drainage Unit, Series: 2000, For Use With: Float and Thermostatic Trap, Specifications: 3/8 in NPT, 264 psig, Stainless Steel

The drainage device is to be used on the bottom drain connection on float and thermostatic steam traps or drain traps in outdoor installations where freezing may occur. When the pressure drops below 3 psig the device opens to completely drain the trap body. The unit will close at pressures above 3 psig.