Three-way check valve: This air compressor check valve has three male threaded connectors to connect the air compressor Easy to install: This air compressor check valve is threaded and the end of connection is easy to install Alloy material: this air compressor check valve is made of zinc alloy, not easy to rust, safe and durable Thread : The three thread diameters of this air compressor check valve are 9.5-10mm, 16-16.5mm and 20-20.5mm respectively; external thread size is 1/2 inch, 3/8 inch Ideal Replacement: This air compressor check valve is better to replace the old air compressor check valve. air 1.This air compressor check valve has three male thread connectors to connect the air compressor. 2 .This air compressor check valve is threaded and the connection end is easy to install. 3.This air compressor check valve is made of zinc alloy. 4.The three thread diameters of this air compressor check valve are respectively 9.5-10mm, 16 -16.5mm and 20-20.5mm. 5.This air compressor check valve is better to replace the old check valve of the air compressor. Specifications: Product Name: Air Compressor Check Valve Material: Zinc Alloy Color: gold Thread diameter: 9.5-10mm 16-16.5mm 20-20.5mm Total size: 42 x 39 mm Male thread: 1/2" 3/8" Hex Head Size: 18mm Note: Please allow a little size error due to manual measurement. Package Included: 1 x Air Compressor Check Valve