One pump (white part) only. It has two output ports.

來源: RomaVacation 於 2025-12-07 17:08:43 [] [舊帖] [給我悄悄話] 閱讀數 : (557 bytes)

https://bbs.wenxuecity.com/fdcj/1873948.html

There is a small cabinet to hold zone control board. Air pump (1"-2")  is underneath board. tens of inch WC in pressure and vacuum. You can see photo in the above posting. 

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