Most popular bracket for all rectangle shaped Basic Inlet Valve Covers. Install into new construction by nailing or screwing it into a stud. For existing home installation cut the plastic stud mounting side off and set it in a 2-3/8" x 4-1/4" hole cut into drywall (or wall material). Fasten inlet cover (with attached low voltage wire) to backing plate for a long lasting, firm hold. When piping, connect a fitting such as a tight 90 or coupling to the flange on the back side of the mounting bracket. For existing installation it is helpful to glue the fitting on before mounting it with the vacuum plate to the wall. If you need a case of these enter 75.