Isotherm Self-Pumping Cooling Units Mar 2, 2014 8:16:52 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by ianpowolny on Mar 2, 2014 8:16:52 GMT Anybody know about these units. I see they are different from a refrigerator keel cooler and can be fitted in to an existing waste fitting. How effective are they. Force 4 has them as full kits.