![4CH-21](http://ecocircuit.com/cdn/shop/products/4ch-21_{width}x.jpg?v=1623786223)
18 SQ FT Threaded Filter Cartridge
4 5/8" x 8"
Bottom Thread: 1 1/2" MPT Threaded
Alternative Number Parts:
4CH-21, PTL18P4, FC-0121
18 SQ FT Threaded Filter Cartridge
4 5/8" x 8"
Bottom Thread: 1 1/2" MPT Threaded
Alternative Number Parts:
4CH-21, PTL18P4, FC-0121