Specifications for 1" Break-A-Way Tank Tee with one front port: Valve composition brass casting; Type L copper tube; Stainless steel lock screws; standard o-ring; precision machining; 3/4" female & 1" male NPT threads each side; 1" NPT thread to tank; 1/2" female NPT thread for drain or relief valve; 1/4" female NPT threads for gauge and switch.