Saratoga NPT Thread Adaptor, Blue 74450 Make filter changes faster with the Saratoga NPT Thread Adaptor, Blue (74450), designed for quick, twist-lock style removal on Saratoga Spas and compatible brands. This fine-thread adaptor converts your filter base to a standard 1 1/2" NPT connection, ideal for cartridges with a slotted bottom. Key features & benefits Quick filter removal by twisting the adaptor instead of wrestling with the entire filter body, simplifying routine maintenance. 1 1/2" male NPT fine thread base provides a reliable, standard connection to spa plumbing. Blue color-coded design clearly distinguishes the fine-thread NPT version from the yellow coarse-thread Acme style (74451). Compatible with slotted filters that feature two slots on the bottom to lock onto the adaptor, including select Saratoga cartridges like 74455/74456. Specifications Part Number: 74450 (fine-thread blue adaptor) Thread Type: 1 1/2" MPT (NPT fine thread) Length: Approximately 4" long Use: For filters with two-bottom slots that mate to the adaptor Companion Part: Yellow coarse-thread “Acme” adaptor, Saratoga #74451 (sold separately) For best results, confirm your filter has the two alignment slots on the bottom before using this adaptor, ensuring a secure, twist-lock fit and easy filter service.