The AquaCal AutoPilot tailpiece is designed for compatible plumbing applications where a serviceable connection point needs to be restored. A tailpiece like this is useful because it helps complete the union-style plumbing connection while the included O-ring supports the sealing side of the repair.This replacement is especially useful when the original tailpiece is cracked, worn, damaged, or no longer sealing confidently at the connection point. Having the O-ring included also makes it a cleaner service solution when the goal is to restore both fit and sealing performance at the same time.The 312-C-SVC is a practical repair part for compatible AquaCal AutoPilot systems that need renewed connection support and dependable sealing performance. AquaCal AutoPilot tailpiece 1-1/2 inch size with included O-ring Helps restore serviceable plumbing connections Useful when the original tailpiece is damaged or leaking Supports cleaner, more dependable connection performance