Coates Heater 1 Stage Sequencer (21005501) manifolds Wide mouth skimmer bodies are especially Wide mouth skimmer bodies are especially practical in repairs where the visible and structural portions of the original housing have both degraded This Hydro Quip item is associated with Circuit Board Parts and is selected for control system service when the existing part no longer performs as expected or when a system rebuild requires a correctly matched component A sequencer helps stage electrical operation within the heater so power is applied in the intended order this sequencer helps restore dependable staged control and contributes to a stronger heater repair overall