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Filbur FC-3960
The new part number is - ME-40226-20
5" intake and discharge (3-5/8" across the treads outside to outside)
Many factors affect your water such as filtration
AquaChek Salt System Test Kit (Sodium Chloride) Frci, Ph, Ta, Cyan UOM:EA Filbur FC-3960Salt System Test Kit (Sodium Chloride) FrCI, pH, TA, Cyan is a spa water care product designed to support clean, balanced, and well maintained water. Proper chemical care is an important part of keeping your spa water clear, comfortable, and ready to enjoy. Supports regular spa water care maintenance Helps keep water balanced and manageable A practical part of routine spa upkeep Designed for dependable maintenance support Ideal for keeping your water