Plastic Bypass assembly.  Includes stainless steel clips and screws as shown.

Compatible with most filter and softener valves, including: 

• CSI Signature 1&2
• WaterSoft Isobar 1&2
• Cygna
• Fleck 5600, 2510, 9100 and more

Older models may have a bypass with black plastic knobs--this bypass valve is a direct replacement for that one.