The Pentek 153128 is an OEM replacement bowl (lower sump) for Pentek's Standard 10" Slim Line filter housing series. It is built to house 2.5" x 10" Slim Line cartridges and threads exclusively onto Pentek Slim Line 10" housing caps. Because of its slim-profile thread design and dimensions, this sump cannot be used with Big Blue or Full-Flow housing caps — those are entirely separate product lines.

The 153128 sump carries a maximum working pressure rating of 125 psi (8.6 bar) and is approved for water temperatures between 40°F and 100°F (4.4°C to 37.8°C). It uses Pentek's proprietary threading to create a leak-resistant seal when paired with a compatible Slim Line cap, and its O-ring groove is precision-dimensioned for that housing family. Because the 153128 is a housing component — not a filter medium — it has no micron rating; that specification is determined entirely by whichever cartridge you install inside it.

Yes. The 153128 sump is manufactured from NSF-listed polypropylene, and the complete Pentek Slim Line housing assembly is certified to NSF/ANSI Standard 42 for structural integrity and material safety. That certification confirms the sump material will not introduce contaminants into drinking water and satisfies industry requirements for potable water filtration applications.

The 153128 is a long-service housing component, not a consumable — expect a service life of five years or more under normal residential or light commercial conditions. That said, visually inspect the sump each time you swap out a filter cartridge (approximately every 3–6 months). Look for hairline stress cracks, material cloudiness, or wear around the O-ring seat. Replace the sump immediately if you observe any leakage, physical damage, or if the system was ever subjected to pressure above 125 psi.

Begin by shutting off the water supply and relieving system pressure by opening a downstream tap. Use a Pentek SW-1A filter wrench to unscrew the existing sump from the housing cap. Apply a thin coat of food-grade silicone grease to the O-ring, drop your 2.5" x 10" Slim Line cartridge into the new 153128 sump, and hand-thread it onto the cap until snug. Give it an additional quarter-turn with the wrench — no more. Gradually reopen the supply valve, inspect all joints for leaks, and run water through the system for at least five minutes before putting it into service.

Not universally. The 153128 is engineered to mate with Pentek Standard (ST) series caps. It is also confirmed compatible with Culligan HF-160 and HF-360 caps, as well as legacy USFilter and Ametek standard caps. Outside of those, cross-brand fitment is not guaranteed - thread pitch and sump-to-cap dimensions can vary enough to prevent a proper seal. Always verify compatibility with your specific cap model before ordering.

No - the package contains only the clear polypropylene sump bowl. A compatible O-ring and food-grade silicone lubricant must be sourced separately. When reassembling, avoid overtightening the sump onto the cap; excessive torque is one of the most common causes of O-ring damage and subsequent leaks.