Simply slip an electrode into this housing and screw it into a tee fitting. Pipe tee connection is 1/2'' NPT(M). Includes a VITON O-ring. KYNAR construction provides a superior chemical resistance. Maximum pressure: 150 psi. Guarded models increase electrode life. KYNAR model is suitable for harsh chemicals. Stainless steel (SS) guard models is ideal for food and high-temperature applications. Housings measures 3-13/16''L x 1'' dia.