Pentair Threaded Half Union Kit, for Clean & Clear RP and Posi-Clear RP | 178733Z

What This Part Is Used For
Pentair 178733Z Threaded Half Union Kit supplies the union connections for Clean & Clear RP filters, D.E. separation tanks, and Sta-Rite Posi-Clear RP filters. The kit includes both half unions plus the retaining clips and seals needed to make a serviceable, leak-free joint at the filter.

Why This Part Matters
Union connections are what let you break the plumbing to service or replace a filter without cutting pipe. A cracked union body, a missing C-clip, or a flattened diamond seal shows up as a persistent weep at the filter, air drawn into the system, or a union that will not pull up tight. Replacing the kit restores a clean, serviceable connection.

Key Features and Specifications

• Pentair manufacturer part number 178733Z
• Includes two threaded half unions
• Includes two union nut C-clips
• Includes two union diamond seals
• For Clean & Clear RP filters, D.E. separation tanks, and Sta-Rite Posi-Clear RP filters
• Genuine Pentair OEM kit

Installation and Fitment Guidance
Shut off circulation and relieve system pressure before breaking any union. Fit the new diamond seals rather than reusing the originals — a reused seal is the most common reason a union weeps after service. Confirm by manufacturer part number before ordering.

Common Service Context
Replaced during filter swaps, separation tank service, or when an existing union cracks or will no longer seal.