api 5000The inside diameter of a # API 6A 5000 PSI weld neck flange is machined to match the inside diameter of the pipe. Tesco Steel & Engineering manufacture a wide range of hh quality5000 API 10000 API 15000 Ø C Ø B A H Ø C A H Ø B. HANDWHEEL OPERATED VALVE GEAR OPERATED VALVE API 6A MUD SERVICE GATE VALVE Working Pressure rating siZE