Dimension One Spas 75 SQFT Filter Cartridge w/ Acme course square thread

265mm H x 180mm D x closed top with D-Handle x 47mm OD Acme course threaded spigot bottom (30mm ID)
Also replaces D1 cartidges with same specifications, but longer.
Used on many D1 models in the early - mid '90's.
Sold individually (image may show multiple cartridges for ID purposes only)