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The Pentek OR-233 is the correct replacement for the following systems: Pentek Under-Sink RO-3000 Reverse Osmosis Systems and Pentek Under-Sink RO-3500 Reverse Osmosis Systems.
The American Plumber OR-233 O-ring is 3″ in diameter and fits Housing Models WLCS-1000 US-600 US-640 SY-2000 SY-2300 SY-2300S SY-2500 SY-2650 RO-3000 RO-3500 WRO-3000 WRO-3500 and Ace 4158622 Water Filter Housings.
