Quote:
Originally Posted by rohrmann
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. If you leave a check valve connected at the hose inlet, you must make sure when it comes time to winterize to install antifreeze to that line also, especially if you have removed the back flow/airgap valve.
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Or winterize even if you do remove the external check valve. Here is pic of mine after winterizing (you can see the pink stuff in the flush lines and the shower lines). The flush line did not drain either direction with the vacuum breaker valve removed.