Ametek Crystal MPM-1/4MPT Connector Hand-tight Crystal adapter fittings rated to 10,000 psi, 1/4 NPT Male (CPF Male). CPF is an improved cone type fitting system that adds a unique o-ring sealing system which permits leak free connections without tools.  CPF fittings can be directly connected to 1/4" medium pressure cone type fittings from other manufacturers*, provided that wrenches are used to complete the connection.  The fittings of the CPF system have been designed and tested to comply with ASME B31.3-2008, Chapter IX: High Pressure Piping.  * HiP: 1/4" Female and Male Medium Pressure (LF4 & LM4 series).  Autoclave Engineers: 1/4" Female and Male Medium Pressure (SF250CX series)