Abstract: A split valve pressure test plug is provided for high pressure fluid systems to sense pressure or temperature by means of a test probe and gauge. The test probe is inserted within split valve resilient valve core members in the test plug. The split valve core members are separable and are interfitted in a male-female relationship to provide for improved sealing upon removal of the test probe. A retainer strap is further provided which retains a cap for the test plug, permits use of a wrench without interference and acts as a sealing ring in addition to a separate gasket when the cap is tightened.

Abstract: A fastener and tightening device for exerting force and equalization of force upon the nut or head of a bolt or threaded stud. The device is comprised of a shank fitting through a support member within an abutment head adapted to be drawn up tight against the support member. A plurality of jack bolts are threadedly engageable with holes in the head and are adapted to be tightened to exert pressure against the support member. Separate ball members are positioned between the jack bolts and a wear plate on the support member to minimize friction and provide for force equalization to counteract any off center alignment.