GRAINGER - HBF4

BREATHER PLUG, RELIEF/FILL, 1/4 THREAD SIZE; NPT, 1-3/8 HEIGHT, 1-13/16 TOP COVER DIA, 2-1/16 OVERALL LENGTH, ALLOWS SEALED PRESSURE SYSTEMS TO VENT EXC ESIVE PRESSURE AS HEAT, PRESSURE BUILD UP AIR RETURNS TO THE SYSTEM AS IT COOLS MODEL: WS5JEZ1