Just got done testing a new pump, it's excellent. Filled all 3 chambers of one 14' x 22" RMR Cat tube in 3 minutes. Best thing is, it's battery powered! http://www.ryobitools.com/catalog/power_tools/specialty_tools/P731 I tested it last night to find out how long a fully charged battery would last; recommended not to exceed 10 minutes of operation, then rest for 10 to allow it to cool. I ran it for 9 minutes, didn't feel warm but rested it at least 10 minutes between run cycles of 9 minutes each. It went 5 cycles of 9 minutes each and ran out at the 6th, 8 minutes and 15 seconds into it. Total run time: 54 minutes. Recharge, less than 40 minutes.And that's the small battery,they make a bigger one, but it's $89. Initially bought as a weed trimmer, works great. So when my Craftsman 3 HP, 125 PSI compressor quit runnining I bought this to air up the truck & trailer tires. It'll fill a float tube in seconds. Only downside is the hose is 12" long. I adapted the 30" hose from my cheap Caddis hand pump to it. For those looking to fill their float tubes or big inflatables like cats and rafts, these are the ticket, no ac or 12V to mess with.