Fleck (11978) ByPass Top Plate Max Adaptor (65-4000) Brass 1/2" NPT x 1/2" NPT x 1/4" (No Adapter) check for leaks

check for leaks

Pressure Check

preventing system water from entering the chemical feed line

or any other flexible or plastic piping materials

failing to draw brine properly

Fleck (11978) ByPass Top Plate Max Adaptor (65-4000) Brass 1/2" NPT x 1/2" NPT x 1/4" (No Adapter) check for leaksFleck Control Valve Component Fleck 5600 ByPass Top Plate (11978) Replacement top plate for Fleck metal bypass valve assemblies across all 5600 series configurations Universal Fit OEM Part Metal Construction The Fleck 11978 top plate is the upper component of the metal bypass valve assembly found on 5600 series control heads. This single part covers both 3 4 inch and 1 inch bypass configurations and works across all generation versions of the Fleck