The AquaCal AutoPilot half union is designed for compatible chlorine generator and plumbing applications where a serviceable 2 inch slip connection is needed. A half union is useful because it helps create a removable plumbing joint, making future maintenance and equipment service much easier.This replacement is especially useful when the original half union is cracked, worn, or no longer fitting securely. Restoring the correct union component can help bring back a cleaner, more dependable connection at the equipment pad.The 312-B is a practical replacement part for compatible AquaCal AutoPilot systems that need a fresh half union to restore secure plumbing fit and easier serviceability. AquaCal AutoPilot half union 2 inch slip design Helps create a serviceable plumbing connection Useful when the original half union is cracked or worn Supports cleaner, more dependable equipment connections