Nobles Water Filter Strainer Bowl - Quantity 2 - Part 613991- Replacement. Fits Nobles Models 1701 Plus, Speed Scrub 2401, 2601,2701 & 3301, Speed Scrub (SS3) 17, 20, and 24 Inch, Speed Scrub (SS5) 24, 26, 28 & 32 Inch, Speed Scrub 300 & Speed Scrub 500 Walk-Behind Scrubbers and Model Speed Scrub Orbital Automatic Floor Scrubber. Replaces part number 613991. Overload Sales Group is Your Source for All Things Clean!