Pentair COM Port Expansion Module with 1' Cable | IntelliCenter | 520818 C8416 replacement filter cartridge engineered for

replacement filter cartridge engineered for large residential pool filtration systems

When replacing the bypass valve

non-living organics

Just add it to the water - minimize the need for scrubbing

Pentair COM Port Expansion Module with 1' Cable | IntelliCenter | 520818 C8416 replacement filter cartridge engineered forThe Pentair COM Port Expansion Module (520818) is the OEM communication port expansion component for the Pentair IntelliCenter pool and spa automation control system, supplied with a 1' cable. IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED This is a mains voltage electrical control component. Installation or replacement must be performed by a qualified electrician or certified pool technician. Do not attempt to install this component without