The Pentek 158644 is the correct replacement for the following housing:
The 158644 3G Slim Line Filter Housing Cap is sold in a case of 12 and is constructed of high-flow polypropylene (HFPP) that features a pressure release valve for easy filter changes, bleed or optional pressure relief. Also known as part number 158644, this housing cap contains a 3/8" inlet/outlet connection.
Pentek Slim Line Housing Cap specifications:
To prevent cracking of the filter and water leakage, protect your housing system against freezing. The Pentek housing cap is available with threaded ports for a mounting differential pressure gauge.