Zodiac - Winterizing cap without O-ring - R0770100

Zodiac – Winterizing cap without O-ring – R0770100

The Zodiac R0770100 is a winterizing cap designed specifically for the Zodiac AquaPure Ei series salt chlorine generator. This replacement cap is used to seal and protect the cell housing during the winter months when the system is drained and taken out of service. By covering the cell ports securely, the cap helps prevent debris, moisture, and contaminants from entering the system during extended periods of non-use. This particular version is supplied without an O-ring, making it the appropriate choice when you only need to replace the cap itself and the existing O-ring remains in good condition.

The AquaPure Ei series is a compact inline salt chlorinator designed for residential pools. The winterizing cap replaces the cell during the off-season, protecting the internal plumbing connections and the cell housing from environmental exposure. It is a direct OEM replacement part, formerly referenced under part number 391363, and is manufactured to the same specifications as the original component supplied with the AquaPure Ei system.

Technical details and compatibility

The R0770100 winterizing cap is designed as a direct-fit replacement for the Zodiac AquaPure Ei salt chlorination system. It is engineered to match the cell port dimensions of the AquaPure Ei inline cell housing, ensuring a proper and secure fit without modification. The cap is supplied without an O-ring, which means it should only be used when the original or replacement O-ring is already installed and serviceable. If the O-ring also requires replacement, a separate O-ring or a winterizing kit that includes one should be sourced. The part replaces the older reference number 391363, so units carrying either number are cross-compatible within the AquaPure Ei platform.

Suitability and application

This winterizing cap is intended exclusively for use with the Zodiac AquaPure Ei series salt chlorine generator installed in residential pools. It is the correct solution for pool owners and service technicians who need to properly winterize or shut down an AquaPure Ei system at the end of the swimming season. It is not a universal fitting and should not be used on other chlorinator models or brands without confirming dimensional compatibility. If you are unsure whether this cap fits your specific AquaPure Ei unit, check the label on your cell housing or refer to your system documentation to confirm the model series before ordering.