Here's what other sites are saying:
Big Blower Kayak and Raft Pump by Northwest River Supply - The fastest way to inflate or deflate your raft. If you have multiple rafts or travel with your raft on a trailer, this commercial-quality pump will come in handy. It fits most raft valves and fills to 1.75 PSI. A strong 120-volt motor makes for quick inflation, or turn the pump around to deflate. Thumb switch permits one-handed operation, and a 30 foot cord makes reaching valves a cinch.