http://m.ebay.com/itm/251457815300?nav=SEARCH
These are the 12v pumps I use, perfect for transfers and recirc. I have three, for the hlt, the mlt, and my rims tube. I still use a 120v march 809 pump for my bk to whirlpool and chill. It has a flowmeter attached, so I can track transfer volumes...