BPV Series Bullet® Piercing Valves;FITS O.D. TUBING SIZE 1/4" 5/16", 3/8";Utilizes the same type of gasket found under the head of;most air conditioning compressors.;When installed, the gasket compresses the copper tubing;.020" creating a permanent, leakproof seal that will;withstand any pressure and temperature for the life of the;unit. Patented valve gasket application provides 50 times;more sealing area than competitive "O" ring types.;A sealing force of over 180" lbs., torque tested with 500;lbs., pressure tested at 250°F. Precision piercing ;needle is engineered for concentricity and hardness to;insure perfect seating every time. Non-positional - no;adapter valve required. Requires only a 2" clearance area;for installation and operation. Hex key wrench included.