Pentair COM Port Expansion Module with 1' Cable | IntelliCenter | 520818 C8416 Just add it to the

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

providing a real-time indication of filter condition during normal operation

When replacing the bypass valve

and sensitive electronic sensors

that is a known typographical variant of 18219R0100 — both refer to this same cartridge

Pentair COM Port Expansion Module with 1' Cable | IntelliCenter | 520818 C8416 Just add it to theThe 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