Shurflo Pump heat sink 34-007 is 5" long and heat sink 34-006 is 3" long. Why just half cover the pump? This is why we stock the longer 5" model for maximum protection. Both are designed to use on the standard 3" diameter motors for use on 115 volt, 12 volt, and 230 volt models. For use on 2088 and 8000 Series motors. Heat Sink Mounts to standard SHURflo motor to assist cooling in continuous-duty applications. Made from anodized aluminum. Compare to current or past OEM associations: Cool Clip Mytee H349 Shurflo 34-006 3" version Multi-sprayer 50-075 Delavan 50-075 12520.3 50-075 Fits 2088-574-534 2088-514-145 2088-414-534, all Aquatec and Flojet Pumps Works with Delavan 7801, 7802, 7811, 7812, 5800 & 5900 series pumps 20180130dc