CMP Pool Defender Compact Zinc Anode & Water Bond with Copper Wire | 25810-400-050

25810-400-050: 2-inch socket / 2½-inch spigot interfaces; catalog assembly length 7 inches.

Supplied as one Compact Pool Defender unit with four feet of solid copper bonding wire. A reducer bushing and replacement service parts are separate purchases.

Choose the Compact model with the required 2-inch socket / 2½-inch spigot interfaces and verify available installation clearance. The separately listed CMP 25810-350-050 is the without-wire configuration. The separately listed CMP 25398-010-000 is a reducer bushing; it is not included as an extra accessory. The separately listed Compact service parts are CMP 25810-400-950 (zinc element) and CMP 25810-400-100 (cover).

Have a qualified pool professional install and service the actual Compact model and verify bonding under applicable current local and electrical requirements. Shut off circulation and electrical power, prevent restart and relieve pressure before service. The device must remain in contact with water for its water-bonding function. Do not substitute instructions for the differently numbered older Deluxe assembly.

The zinc element is intended to corrode sacrificially within a properly bonded system, helping reduce galvanic corrosion of other metal components. Inspect the anode regularly and replace it when about half has eroded, following the actual model’s service instructions. Service life depends on conditions; a calendar life is not guaranteed.

The manufacturer’s 2026 catalog lists UL-1081, UL-1563, CSA C22.2-218.1 and NEC2008 680.26(C) for this Compact family. These are the manufacturer’s published references, not confirmation of the latest code edition or approval of an entire installation. A qualified professional must verify the current applicable requirements and continuous water contact.

CMP’s standard limited warranty covers defects in materials and workmanship for one year from original purchase unless otherwise noted, subject to its conditions and exclusions. The linked statement limits coverage to the United States.