“Ducks Nest” design of thief hatch. Unit is lockable, with a spring loaded
aluminum cover and base. Standard gasket material is Buna-N with other gasket
material available. Settings of 4oz pressure and .4 oz vacuum are standard.
Pressure settings of 8, 12, and 16 oz are also available. Flange bolt pattern
conforms to API pattern
Bolt Pattern: (16) – 1/2″ dia holes on a 10 3/8″ B.C.