Description
Ensure a watertight seal on your reverse osmosis (RO) membrane housing with this essential replacement sump O-ring. Designed for the lower portion (sump) of standard residential RO membrane housings, this O-ring helps prevent leaks and maintain proper system pressure — a small part that plays a big role in keeping your water treatment system performing reliably.
Product Details
- OEM Part Number: 143483
- O-Ring Size: #928 (sump seal) — fits the groove in the membrane housing base
- Type: Elastomer (typically EPDM)
- Function: Creates a watertight seal between the RO housing sump and its cap, preventing leaks under normal operating pressure
- Fits most residential 10″ RO membrane housings with standard 1/8″ port membrane housings (e.g., Pentek® 020-MVH90 housings)
Compatibility
This #928 size O-ring (Part #143483) is commonly used as the sump seal in residential reverse osmosis membrane housings. It is designed to pair with the correct cap O-ring (Part #143484, #227 size) to fully seal the membrane housing assembly.
- Compatible with: Standard RO membrane housings such as Pentek/Pentair models that use #928 sump O-rings
- Pair with: Part #143484 O-Ring (#227) for the housing cap seal
Why It’s Important
While small, this O-ring plays a critical role in RO system reliability by:
- Preventing leaks at the membrane housing sump
- Maintaining proper internal pressure
- Supporting consistent RO performance and water quality
O-rings age over time due to compression and chemical exposure; replacing them during maintenance helps avoid costly water damage and system downtime.
Installation & Maintenance Tips
- Clean surfaces: Before installing the new O-ring, clean the housing and grooved area to remove debris.
- Lubricate: Apply a thin coat of food-grade silicone lubricant to improve seal longevity and ease installation.
- Inspect regularly: Check O-rings any time you open the housing — replace if brittle, cracked, or deformed.
- Replace as needed: Small, inexpensive replacements help prevent leaks and maintain performance.
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