Fangrui Product Details Fangrui Product Details Material: The Air Valve Cap Made Of Quality High Dense Plastic, Sturdy, Anti- And . Quickly Inflation Deflation: The Air Valve Cap Can Fit Into The Bottom 20 Mm / 0.78 Inch Hole, Boston Valve To Help Quicker Inflation And Deflation. 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. Nice Design: The Great Design With A Valve Cap Ensures Anti-leak Inflation,two Way Air Valve, Which Is More Easier To Inflate Quickly. Widely Use: Fits Most Inflatable Boat, Raft, Rubber Dinghy, Etc. Please Measure The Valve Size Of The Inflatable Boat In Advance Before Purchasing. Colour:black Material:plastic Package Contents: 4 * Boston Valve 4 * Gasket 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.