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This is known as the Tri-X® filter holder, it screws onto the top of the filter standpipe to hold filter cartridge in place.
Part number 31389HS
This is used to support is compatible with Tri-X filters for Hotspring/Watkins spas.
Outer diameter : 50 mm
Inner diameter : 44mm
Handle outer diameter : 82 mm
Max file size: 6 Mb
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