Description Signature/Bullfrog Spas 25sq.ft Nature 2 Replacement Cartridge Outside Diameter 200mm. Length 150mmmm. Top-end open hole Nature 2 Replacement Cartridge (Using the plug to close hole) . Bottom-end 59mm SAE Thread Has a open top and the bottom has a coarse thread spigot. In The Box – Signature/ Bullfrog 25 cartridge.
