Australian Spa Parts

Signature Spas Swim Spa BOTTOM threaded skimmer filter cartridge - 50 sqft,
open top with lugs to accomodate slip fit top cartridge, SAE (course) threaded bottom. 225mm L x 145mm diameter x 50mm OD threaded bottom.    
When both top and bottom filters are assembled together the overall length is 460mm high 
These filters should be purchased and replaced as a pair (top & bottom)
NB this filter set is very similar to LR100T and B - which have an overall assembled length of 425mm