550-0701 | Waterway Pro Clean Plus Lock Ring

The Waterway 550-0701 is an OEM lock ring assembly designed for the Waterway Pro Clean Plus cartridge filter series. The lock ring is the mechanism that secures the filter tank lid to the base under operating water pressure, creating a watertight seal that keeps the system pressurized and functioning properly throughout the filtration cycle. A cracked, warped, or broken lock ring is one of the most common causes of filter lid leaks and pressure loss on the Pro Clean Plus series, making timely replacement an important maintenance task. Important fitment note: the 550-0701 is the new-style lock ring and is compatible only with Pro Clean Plus filter bases manufactured 2015 and newer, since a separate lock ring is available for pre-2015 bases. The 550-0701 is also cross-referenced as Leslie's and Jacuzzi part number 370245.

Highlights

• Waterway OEM Lock Ring Construction: Factory-authorized 550-0701 lock ring assembly manufactured by Waterway Plastics to exact OEM specifications, providing a precise, secure fit on all compatible Pro Clean Plus cartridge filter bases manufactured from 2015 to the present and ensuring the lid clamps and seals correctly under pressure.
• Verify 2015 or Newer Base Compatibility: The 550-0701 is the new-style lock ring and fits only Pro Clean Plus filter bases manufactured in 2015 or later, since Waterway uses a separate lock ring design for pre-2015 bases, and customers should confirm their filter's manufacturing date before ordering to ensure correct fitment.
• Restores the Watertight Pressure Seal: The lock ring clamps the filter lid securely to the tank body under operating pressure, and because a damaged or worn ring is one of the leading causes of lid leaks, pressure loss, and reduced filtration performance on the Pro Clean Plus series, swapping in the correct OEM ring returns the seal and system pressure to spec.
• Integrated Yellow Latches Included: The lock ring assembly features integrated yellow latches that are not sold separately from the ring itself, making the 550-0701 the complete replacement unit needed to fully restore the lid-to-base locking and sealing system on compatible Pro Clean Plus filter models.
• Cross-Referenced as Leslie's/Jacuzzi 370245: Verified as a direct cross-reference for Leslie's and Jacuzzi part number 370245, allowing customers to confirm fitment quickly across multiple parts sourcing platforms and service references when shopping by either Waterway or Leslie's/Jacuzzi part numbers.