Watts (FM-BB-20-1) 20"X4.5" Big Blue Pleated 1 Micron Sediment Filter TPTZ Method (100 Tests) and 8500 valve bodies

and 8500 valve bodies

Optional Valve Ready

The larger-diameter outer layer functions as a depth pre-filter

so this cartridge has a finite lifespan even if flow remains clear

Watts (FM-BB-20-1) 20"X4.5" Big Blue Pleated 1 Micron Sediment Filter TPTZ Method (100 Tests) and 8500 valve bodiesThe Watts FM BB 20 1 is a 20"x4. 5" pleated sediment filter engineered for whole house applications where fine sediment removal at 1 micron is critical. Built with color coded Plastisol end caps and cleanable pleated polyester media, this Big Blue cartridge delivers reliable performance without surface blinding or flow reduction. SPECIFICATIONS Watts FM BB 20 1 Core Specs Dimensions 20" x 4. 5" Big Blue standard Micron Rating 1 Micron Fine sediment