Receptacles – Closures – Secondary closure within parameter of primary closure
Patent
1988-03-14
1989-03-21
Hall, George T.
Receptacles
Closures
Secondary closure within parameter of primary closure
138 89, B65D 5118
Patent
active
048135690
ABSTRACT:
A method of sealing an open end of a plumbing drain pipe for leak testing the pipe comprises the steps of terminating the drain pipe in an open externally threaded end; and attaching a screw cap to the externally threaded end portion. The screw cap comprises a body including a cylindrical portion having internal threads for attachment to the externally threaded end portion of the drain pipe; and an end wall enclosing one end of the cylindrical portion and defining, with the cylindrical portion, a cavity. The end wall has a generally planar internal surface. A thick circular sealing disk, disposed within the cavity, has a diameter sufficient to cover the open end face of an attached pipe. An anti-friction washer is disposed between the sealing disk and the internal surface of the end wall which allows the sealing disk can rotate independently of the body; such that, as the body is threaded onto a pipe, the sealing disk does not rotate after encountering the pipe's open end face. A threaded plug in the end wall allows attachment of a hose. Preferably, the drain pipe is terminated by attaching a common trap adapter.
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