[High Quality]: Made of quality high dense PP plastic, sturdy, anti-corrosion and durable. [Cap Desgin]: The air valve cap design is sealed ensures anti-leak inflation. The upside diameter/length of Threaded part is 22mm (out)/ 17mm(inner), the underside diameter/length of Threaded part is 22mm (out)/ 20mm(inner). Please check size to make sure whether your valve bung fit this plug before purchase. [Special Rubber Pad]: The bottom of the air plug has a rubber mat which can prevent leaks more effectively, give you protection.One-way inflation valve, quickly inflated. [Quickly Inflation & Deflation]: It will fit into a hole that is about 20mm/0.78 inch, boston valve to help quicker inflation and deflation. Easy to fit, good performance and long life. [Come in Pair]: Good replacement accessory for your inflatable boat. Fits most inflatable boat, raft, rubber dinghy, etc. Please pay attention to the size before purchase, and our gas nozzles are not all suitable for all sizes of airbeds and inflatable boats, special size , like netted ship. Colour: black Material: PP Package Contents: 5 x Air Valve Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.