Coates Heater 1-Stage Sequencer (21005501) gridcontrols Specialty tools like this are

Specialty tools like this are useful because they help make pipe repair more precise and less disruptive than cutting out full sections of plumbing

This version is especially useful when the original spa check valve is no longer seating reliably

For compatible larger-diameter plumbing installations

Flush air buttons are a key part of many bath systems because they provide simple

Coates Heater 1-Stage Sequencer (21005501) gridcontrols Specialty tools like this areA sequencer helps stage electrical operation within the heater so power is applied in the intended order, and this Coates 1 stage sequencer is designed for compatible heater applications where the original control component has failed or become unreliable. When the staging side of the heater stops functioning correctly, the unit can lose the smooth, controlled operation it depends on. The 1 stage design gives this part practical value because