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Colyn,
The check valve provides and alternate source for venting in case the exterior vent gets iced up.
Chris
From: Colyn Case at earthlink <colyncase@earthlink.net>
To: lml@lancaironline.net
Sent: Saturday, November 29, 2008 7:08:48 PM
Subject: [LML] Re: Tank vent.
how does the check valve guard against icing?
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