{"product_id":"pentair-com-port-expansion-module-520818","title":"Pentair COM Port Expansion Module with 1' Cable | IntelliCenter | 520818","description":"\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0; color: #856404;\"\u003e\u003cstrong\u003eIMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED\u003c\/strong\u003e\u003cbr\u003eThis 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 proper certification.\u003c\/p\u003e\n\n\u003cp\u003eThe COM Port Expansion Module extends the communication capacity of the IntelliCenter control system, enabling additional devices or control interfaces to be connected to the system's communication bus. When this module fails or loses communication, the devices connected through it will stop responding to automation commands. Confirm part number 520818 against your existing module's label or your IntelliCenter installation manual before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003ePentair Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e520818\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eProduct Series\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eIntelliCenter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eCable Length Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e1'\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePoolaroo Pro Tip\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, locate the part number printed on your existing module's label or find it in the parts list section of your IntelliCenter installation manual. Communication module compatibility can vary between IntelliCenter control system revisions — confirm your load center generation against the part number before purchasing. If you are unsure which module version your system requires, consult a Pentair-certified pool automation technician or refer to current Pentair IntelliCenter documentation.\u003c\/p\u003e\n\u003c!-- wft:processed:manual:2026-05-01 --\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":51774122983699,"sku":"520818","price":130.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/PEN520818_0.jpg?v=1747699685","url":"https:\/\/poolaroo.com\/products\/pentair-com-port-expansion-module-520818","provider":"Poolaroo","version":"1.0","type":"link"}