The PMS-20 Compatible is a compatible replacement for the following pool and spa filters:

• Muskin 20
• Muskin A3821
• Muskin FD-20
• Muskin FD-40
• Muskin FE-20

The PMS-20 Compatible Replacement Pool & Spa Filter is a spa filter cartridge that measures 6 1/4" in diameter x 8" in length with 2 3/8" Open top & bottom styles. Featuring 20 square feet of media area this compatible filter purifies swimming pool & spa water.