Rheem Protech sequencer by Thermodisc. 2 poles, 25 amps, 24 volts. Poles are labeled M1, M2, M3 & M4. For the M1/M2 poles, the switches close in 10-40 seconds (H10-40), and opens in 90-160 seconds (C90-160) after power is cut.
Click to watch how a sequencer works ---> https://youtu.be/5YjL8eR5VJ0
For the M3/M4 poles, the switches close in 10-30 seconds (H10-30), and opens in 30-60 seconds (C30-60) after power is cut. Also known as part # 422311606, 42-23116-06-02 and 305864.