This FreshWater Ag+ gray standpipe cap locks your spa’s filter firmly in place on the gray standpipe, ensuring stable operation. It’s the designated cap for inserting the Fresh Water Ag+ Silver Ionizer, especially important if your spa has multiple filters.
Independent Supplier & Replacement Part Notice
We are an independent parts supplier and are not affiliated with, sponsored by, or endorsed by Watkins, Hot Spring, Caldera, Tiger River, or Solana. These names and their part numbers are used only to identify compatibility.
We offer replacement parts as alternatives to spa-branded parts. When this listing identifies a part as the same original-manufacturer replacement, it is supplied under the component manufacturer’s branding and part number, which may differ from the Watkins or spa-brand label and number. Other compatible alternatives are identified in the individual product listing. Please review the listed specifications, fitment details, and any installation differences before ordering.
Handles filters measuring 10 1/2" tall by 6" wide by 10 1/2" with two 1 15/16" holes at the top and bottom.
Fits numerous spa lines: HotSpring models from 1989 through 2025, including Aria, Grandee, Jetsetter, and others. Compatible with HotSpot, Limelight, Solana, and Tiger River models as listed in the detailed fitment guide.
Part number FC-3915 C-6430 PWK30.
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Take the time to check your exact model, model code, and year before ordering. Spa manufacturers often revise models, so correct identification is key.
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