Pentair Com Port Expansion Module | 520818 Unions Adjustable return wall/floor inlet fitting

Adjustable return wall/floor inlet fitting for in-ground concrete or gunite pools

bright appearance without causing damage to the vinyl material

Proprietary NeverLube technology (maintenance-free valve design)

LED Efficiency: Reduces energy consumption significantly

Pack weight approximately 6

Pentair Com Port Expansion Module | 520818 Unions Adjustable return wall/floor inlet fittingPentair Serial COM Port Expansion Board Kit (Adds RS 485 Communication Ports) 520818 The Pentair 520818 is a Serial COM Port Expansion Board kit used to add additional RS 485 communication ports to compatible Pentair pool spa automation systems. Its commonly installed when you need more connection points for equipment such as variable speed pumps, salt systems, heaters, or other RS 485 devices that communicate with the control panel. Key Features Adds