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

来源: 于 2025-12-07 17:08:43 [旧帖] [给我悄悄话] 本文已被阅读：次

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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.