Watts (FM-BB-20-1) 20"X4.5" Big Blue Pleated 1 Micron Sediment Filter TPTZ Method (100 Tests) Tighten connections if minor leaks

Tighten connections if minor leaks develop

0 GPM Connection Size 3/8" Female Pipe Thread (FPT) Material Injection Molded Polysulfone Configuration Inline (IL) Mount Scale Type Dual Scale Display Adapter Style Quick Loc (1/2" Union) Chemical Resistance High (Polysulfone Construction)

The single-junction design makes it well-suited for tap water

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

and 8500 valve bodies

Watts (FM-BB-20-1) 20"X4.5" Big Blue Pleated 1 Micron Sediment Filter TPTZ Method (100 Tests) Tighten connections if minor leaksThe 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