The Pulsar® 71537 1/4" 4-Pack PVC Mounting Screws for Pulsar® 1 Emergency Shut Off Plate is a set of screws intended to repair or replace the original mounting plate screws in a Pulsar® 1 pool maintenance system. This four pack of screws helps to secure and hold the mounting plate component of the system. For best results, always refer to manufacturer directions for repairing, replacing, or adding components to pool maintenance systems.