This pack consists of critical components necessary to bring valves back into service, quickly and conveniently. The life of our quality valves can be extended economically and effectively in this manner. This plunger pack if for Shower-trol® valves #SV101B, 24 volt and #SV101C-NY, 12 volt. It includes the complete plunger assembly, o-ring and spanner wrench. Chose your voltage based on your current installation.