The Pentek 154584 is the correct replacement mounting bracket cap for the following housings:
The 3G 3/4" NPT Filter Housing Mounting Bracket Cap is a replacement filter housing mounting bracket cap for all Pentek 3G Housings. 3G refers to Third Generation Style Housings and are the newest designs available. This filter cap features a 3/4" inlet NPT/outlet connection and does not include a pressure release button. In addition, this Pentek water filter housing is constructed with durable polypropylene in order to be longer lasting.
3G 3/4" NPT Filter Housing Mounting Bracket Cap specifications: