Abstract: In an adapter unit for use between an external filter element and fluid reservoir are dual thermostatic pressure relief valves. A body member with a curved recess has ports with opposing valve seats communicating with the recess, and a curved leaf member of approximately three-quarters of a full circle is disposed in the recess and is operative as a double valve gate. The leaf member is at least one bimetal strip having a reversal of high expansion and low expansion sides at a preselected point at approximately one-third of its length from an anchor point. Changes in ambient fluid temperature cause a substantially linear displacement between opposing valve seats at the free end of the leaf member.

Abstract: A device for connecting an auxiliary oil cooler to an existing automobile oil cooling radiator includes a length of tubing having a flared portion at each end. Slidably secured about the tube is a fitting which includes an exterior hex portion for engagement by a wrench, and an exterior threaded portion which is adapted to be secured in a standard, threaded female radiator fitting. The fitting of the invention also includes an interior threaded portion which is adapted to be secured about a standard male radiator fitting.

Abstract: A tension fastener for quick-mounting an oil cooler in stacked relationship on one side of the radiator or condenser in an automotive or other engine system.