High Quality:Made of quality high dense ABS 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 safer protection.One-way inflation valve, quickly inflated. Quickly Inflation & Deflation: It will fit into a hole that is about 20mm/0.78 inch, air valve to help quicker inflation and deflation.Easy to fit, good performance and long serve life. Come in Pair: Good replacement accessory for your inflatable boat. Fits most inflatable boat, raft, rubber dinghy, etc. Pl 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 not applicable, like netted ship.