Features: 1.The set of the pump air valve adapter has a universal standard, which fits most rubber boat, inflatable boat, inflatable kayak, canoe, paddle board pump adapter, river raft, fishing boat, rafting boat, dinghy, etc. 2.Comes with 2 soft spacer sealing rings. One 0.165 thick, other 0.23. Rings have a slight central depressed circle on one ..