Get a Pentek spanner wrench for housings and loosening sumps when changing filters. When shopping at Serv-A-Pure, we make it easy to help you find the most appropriate spanner wrench for a particular install. Loosening and tightening are essential in housing and sump pump repair. That is why having the right spanner wrench is so important. Order spanner wrenches and other water filtration parts from Serv-A-Pure today!