GAS VALVE PLACE OF ORIGIN : NINGBO CHINA CONNECTION SIZE :FOLLOW DEMAND INLET ... NINGBO CITY,WE ARE A PROFESSIOANL MANUFACTURE SPECILIZED IN PRODUCING ALL KINDS OF GAS REGULATOR ,GAS VALVE, ALSO WE CAN DO OEM ... .WE HAVE THE CE CERTIFICATE , ISO 9001:2000, SNI , AND MANUFACTURE LICENCE. gas ...