8″ Thief Hatch, Round (54)

Durable relief valve designed for storage vessels requiring pressure and vacuum venting.  An 8″  dead weight cover opens completely, to allow for high venting capacity. Standard settings are  2 oz pressure and 0.4 oz vacuum, with other settings available.  The #54 can be ordered with bolting or welding base. Flange hole pattern complies with API bolt circle dimensions.  Standard gasket is neoprene, other gasket materials available.

Bolt Pattern: (16) – 1/2″ dia holes on a 10 3/8″ B.C.