Manual valve can close or open the air/oxygen/water/oil within the gasOnly pneumatic connectors, aside from different equipment in the picture.material: plasticColor:Black / White Same quality, if white is out of stock, black will be used insteadCard shell: nickel-plated copperCirclip: stainless-steel Diameter: 4/6/8/10 / 12mm Male Thread Size: 1/8", 1/4", 3/8", 1/2" BSPTTips:01=1/8" Threaded=9.7mm02=1/4" Threaded=12.7mm03=3/8" Threaded=16mm04=1/2" Threaded=20mm