Pressure test cap

Apparatus for sealing a duct, said duct having a radially inwardly shaped end portion, said apparatus being characterized by;

• a sealing cap for enclosing and sealing said shaped end portion and having a portion conforming to the shape of said shaped end portion,
• an expansible collet for disposal within said shaped end portion of said duct, said collet having an outer surface conforming with the shape of said shaped end portion, and
• actuating means extending through said sealing cap and engaging said expansible collet for expanding said collet radially outwardly to engage said shaped end portion between said outer surface of said collet and said portion of said sealing cap such that said duct is sealed by said sealing cap, and for contracting said collet radially inwardly so that said sealing cap and expansible collet may be either removed or mounted upon said duct as may be required, said actuating means comprising;
• a screw having a portion disposed outside of said sealing cap and a threaded portion disposed within an interior portion of said duct,
• a nut disposed upon said threaded portion within said interior portion of said duct for longitudinal movement thereupon and having a cammed outer surface for cooperating with said collet such that longitudinal movement of said nut in a first direction expands said collet radially outwardly and longitudinal movement of said nut in a second direction contracts said collet radially inwardly.