This sail board is made of same 140mm high presure drop stitch fabric as Saturn inflatable paddle board. It can take up to 12 psi of air pressure and become as hard as rock when inflated. Sail mast is inerted
Provided by www.BoatsToGo.com instructions how to replace air valve in a chamber of inflatable boat or inflatable kayak, raft, etc. Special tool for valve replacement is needed to replace valve. This valve replacement tool should be included inside repair kit.