The Pentair 158739 Slim Line housing delivers dependable single-cartridge filtration in a compact 10-inch form factor ideal for point-of-use installations. Built with reinforced polypropylene construction throughout, this white flat cap housing handles low-flow applications from under-sink filters to RV water systems with proven chemical resistance.

SPECIFICATIONS

Pentair 158739 Housing Details

Model Number	Pentair 158739
Housing Type	Slim Line Flat Cap
Cartridge Size	10 inch standard
Cap Material	Reinforced polypropylene, white
Sump Material	Reinforced polypropylene, white
Inlet/Outlet Thread	1/4 inch NPT
Pressure Relief	No PR valve
Max Flow Rate	Low-flow applications

INSTALLATION & USE

Installing Your Slim Line Housing

Mount the flat cap bracket securely to wall or cabinet surface, ensuring adequate clearance below for sump removal and cartridge replacement.
Apply thread sealant tape to 1/4 inch NPT connections and thread inlet/outlet lines hand-tight, then snug with wrench to avoid over-torquing polypropylene threads.
Insert your chosen 10-inch cartridge into the sump, lubricate the o-ring with food-grade silicone, and thread sump onto cap until hand-tight with proper seal compression.
Open water supply slowly and inspect all connections for leaks before putting housing into full service.

COMPATIBILITY

Cartridge & Application Fit

This Pentair 158739 housing accepts all standard 10-inch cartridges with 2.5-inch outer diameter, including sediment, carbon block, pleated, and specialty media filters from Pentek and compatible manufacturers. The reinforced polypropylene construction offers excellent chemical compatibility for pre-RO filtration, post-RO polishing, under-sink drinking water systems, ice maker lines, beverage equipment, RV and marine applications, and humidifier supply lines. The 1/4 inch NPT ports are sized for low-flow residential and light commercial installations where compact footprint and reliable performance matter.

🔧 Pro Tip: The flat cap design mounts flush against walls or inside cabinets better than standard cap housings. Since this model has no pressure relief valve, always turn off water supply and press the red pressure release button on your cartridge before unscrewing the sump to avoid trapped pressure and potential spray.

Pentair (158739) 10" Slim Line Flat Cap Filter Housing 1/4" NPT White Sump No PR