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1/2" (.700 OD) Compression Coupler with Air Relief Valve

CIS ModelLF327
$8.20
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1/2" (.700 OD) Compression Coupler with Air Relief Valve

This air relief valve fitting for .700 OD poly tubing is used to allow air to escape during the system start up and shut down, preventing water hammer at start-up and vacuum at shut-down.

Preventing a vacuum at shutdown prevents drippers from drawing back in anything in case they may be face down in wet soil. One or two of these on each zone is inexpensive compared to replacing drippers or dripline.

The vacuum relief should sit clear of any dirt or debris so you might want to add a short riser and 1/2" threaded coupler to raise it up some. See the related parts below.

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