Features This is hex female thread air check valve which is easy to install and remove, can be used for water connection Suitable for connection of pipes under gas, water, oil and other media High quality stainless steel material, stable performance, not easy to rust and good airtightness Available in 4 styles for choice: 1/8in, 1/4in, 3/8in, 1/2in Accuracy BSPP female thread, easy to connect without slipping Specification: Condition: 100% Brand new Material: 304 Stainless steel Thread: BSPP female thread Optional Style: 1/8in, 1/4in, 3/8in, 1/2in   Package List: 1 x Air Check Valve Features: 1. High quality stainless steel material, stable performance, not easy to rust and good airtightness 2. Accuracy BSPP female thread, easy to connect without slipping 3. This is hex female thread air check valve which is easy to install and remove, can be used for water connection 4. Available in 4 styles for choice: 1/8in, 1/4in, 3/8in, 1/2in 5. Suitable for connection of pipes under gas, water, oil and other media Package List