Thanks - I read some reviews and people are very pleased with this product. Apparently uses titanium contacts for corrosion resistance which seems like some thoughtful engineering.
SEAFLO 12V DC 1.2 GPM 35 PSI 21-Series Diaphragm Water Pressure Pump for Marine Boat RV Caravan ~ $30. Available on Amazon and most marine supply stores.Here is a kit with a timer and all the parts you need for installation. It uses the pump listed above. http://www.drybilgesystem.com/ ~$400
Just be sure to use a waterproof fuse holder for the pump and waterproof all electrical connections. On my tune there was a bracket in the rear of the compartment to mount the pump.