Replacement product: K-Rain Pump Start Relay Plastic Screws (4-pack) are designed to securely close K-Rain pump start relay enclosures. Made from durable, corrosion-resistant plastic, these screws maintain enclosure integrity and ensure long-lasting irrigation system performance. Compatible with models PSR-1510, PSR-1520, and PSR-1551. Perfect for landscapers, contractors, and irrigation maintenance, these replacement screws help keep your system reliable and functioning optimally. Part # P1000121.