Diameter: 6 3/8"

Length: 14.5"

Top and Bottom Hole: 1 15/16"

OEM: Watkins Hot Springs Spas

Watkins: 78373

Pleatco: PWK35B

Unicel: N/A

Filbur: FC-3921

Single filter only

Watkins Hot Spring Spas 50 sq. ft. cartridge

Warranty Coverage: Replacement Filter Cartridges come with a 5 Year Limited Manufacturers Warranty. The manufacturer warrants their filter cartridges against defects on workmanship and materials. This warranty will be void if the filter cartridges become damaged as a result of improper installation or use. Warranty does not cover labour charges, cost of lost water or chemicals, or any other damages that may occur.

Start a Warranty Claim:To begin a claim please email [email protected] with a photo showing the defect(s)/damage to your Replacement Filter Cartridge and include a brief explanation of what occurred.