The Pulsar® 71525 55mm M3 Long Screw for Solenoid Assembly Pulsar® III Pool Maintenance System helps maintain your Pulsar® III system as a replacement or repair component. This part, properly installed per manufacturer's instructions, will help restore your chlorinator system back to working order and hassle-free operation. For best results, always verify model compatibility prior to ordering components. Screw (Long) M3X55, Timer/Solenoid Assembly