The upper case and lower case are made of die cast aluminum-alloy
ADC12, and the surface treated with corrosion resistance painting,
it can works on a corrosive environment, and has a strong
impact-resistance. To improves the working pressure range and to
prevents the gas leaked from the Steel bar , the upper case and
lower case are fixed by stainless steel screws . The measuring unit
of G series product is the same to the G(S) series product.