Master Spas 20 Sq. Ft. Filter for Contractor Series 415 model & Clarity Series 415 model spas.  Can be used with the Nature 2 Mineral Purification Cartridge, & Leisure Time Spa Minerals Cartridge for Mineral Purification filtration.  Used only in the 415 model spas.

Measures: 4-5/8″ (OD) x 8″ (Length), with 2″ male thread (MPT).  Alternate part number: Unicel 4CH-252, Master Spas Part Number: PMA20-FLM