With the type TVR1 CNG WEH^® offers an advanced, high performance check valve for use with natural gas. The check valve system is designed to minimize the effect of dirt particles on the sealing components within the unit. The WEH^® TVR1 CNG check valve is constructed of corrosion-resistant stainless steel achieving a very durable unit due to its robust internal structure (see also TN1 CNG receptacle).