I wanted to purchase a spare air fill valve for my Scadden float boat. I searched the Internet and was able to locate a spare fill valve for $9 at Mad River Outfitters. The link to the page featuring the valve follows:Valve at Mad River My boat and most others use a Halkey-Roberts valve. I have received the valve and I would say it is high quality. Mad River is a good source of fly fishing/tying supplies. Orders over $25 are shipped free; out of state, so no sales tax. They also have Mustad 3366 hooks in 50 hook packs and tube tying supplies. The link to Mad River Outfitters home page is part of the list of links on our opening page.