1) Safe and security for Family Use. 2) Sealing is good 3) G1.6, G2.5, G4.0 can offer 4) Aluminium casing and shell Sichuan Haili Intelligent & Technology Co.Ltd HK-J2.5H membrane is a volumetric gas meter diaphragm gas meter.It has a beautiful shape, small size, light weight, flow range, measurement accuracy, high sensitivity, safety and reliability, long service life, is the current ...