For anyone looking for a 12volt pump, I got this one off Ebay, from a domestic distributor. Got here quick, and Tested in the bath tub with a 12volt scooter battery and I got plenty of flow for a cooler.
The title was "Indtec Submersible Fountain Pond Solar Water Pump 12V DC "
Profile:
This is brand new water pump S-400A, can be used on submersible or above water, high quality and reliable.
Suitable for: Aquarium,solar-panel circulate system, fountain, electronic refrigerator, water heater etc...

Features:
Voltage: 9VDC ~ 12VDC
Current: 450mA / 550mA
Capacity: 6.6 Liter / Minute, 400 Liter / Hour, 1.75 Gallon / Minute, 105 Gallon / Hour
Noise: <=35dBA/10cm
Working temperature: -35°C ~ +80°C
Service life: 26000 hours up
Motor: DC brushless motor
Pump: Centrifugal pump
Weight: 172g (6.08 oz)
Inlet: 9.8mm
Outlet: 5.5mm
Size: 72 x 59 x 50mm (3" x 2-3/8" x 2")