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 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   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