With minor modifications (see photo) not recommended by my raft builder, this adapter has allowed me to use a high capacity, low pressure electric pump. I bought an automotive tire valve assembly that fits .453" rims for about $1.50 and was able to force the valve into this adapter with some grease. After doing this and setting my air pump to 2.5psi. I could sit back and enjoy my coffee and the air pump did it magically.
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