The Pentek 154101 is the correct replacement for the following:
The Pentek 3/4" Black Cap includes a pressure relief button that reduces the pressure in the housing when changing the cartridge. Also known as part number 154101, this Pentek water housing cap is made from reinforced Polypropylene for durability.
The Pentek 154101 Black Cap specifications:
The maximum pressure for both Pentek Standard Housing units is 125 psi. Both Pentek Standard Housing units have a maximum temperature capacity of 125 degrees Fahrenheit (52 degrees Celsius).