Vent Plug, Relief/Filler, Thread Size 3/8 In., Height 1.375 in, Top Cap Dia. (In. ) 1 13/16 in, Overall Length (In. ) 2 1/16 in, Allow Sealed Pressure Systems to Vent Off Excess Pressure as Heat in System Builds up, Air Pressure is Allowed Back into System as System Cools. This item has been restricted from sale in the following state (s): []