This is for a brand new set of 3 including fresh o-rings. Not dry – manufactured December 2006

Betts Industries replacement for cargo tank leakage test or DOT mandated bench test as part of the cargo tank pressure test.

• PN # 6238AL

• Intake 3350 Cu Ft. HR. 1 PSI

• Exhaust 1750 Cu Ft. HR. 3 PSI

A tank pressure and vacuum relief mechanism for relieving excess pressure or vacuum in a tank interior. The mechanism includes a housing disposed in a wall of the tank, such housing containing a one-way, normally-closed pressure relief valve for venting excessive pressure in the tank to the atmosphere. The housing also contains a one-way, normally-closed vacuum relief valve for admitting atmospheric pressure to the tank interior to relieve excessive vacuum therein. The mechanism seals completely on tank roll-over at any angle to prevent tank product leakage.

US patent number 4287910, Betts Industries, Warren, PA 16365

Defense Logistics Agency categorized as crankcase ventilation