American Plumber W2010-PR - Metal Water Filter Housing Wrench is the best alternative to plastic wrench you will ever find. It is used as a housing wrench. Its filter diameter measures 4.5? which fits the American Plumber W2010-PR filter housing and most #20 Big Blue housings. It is longer than a standard filter wrench with a rubberized handle for extra force. A directional arrow and the word ?loosen? are printed on the handle to prevent breaking of the filter housing unit by turning the wrong direction. This galvanized water filter wrench will not bend or break. It is a popular choice amongst the customers.