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Flow Meter - Winterization

We recommend that a qualified licensed contractor perform this type of winterization method. The blowout method utilizes an air compressor with a cubic foot per minute (CFM) rating of 80-100 for any mainline of 2" or less. The compressor is attached to the mainline via a quick coupler, hose bib, or other type connection, which is located beyond the backflow device. Compressed air should not be blown through any backflow or flow meter device. For additional winterization procedures, we highly recommend contacting the local dealer for the most common local practices. In the event you need to blow upstream from where the flow meter is located, we recommend bypassing the meter by temporarily installing a SCH 80 or galvanized nipple. See the size chart below:

Model Description

Male-Thread NPT

Nipple Length
HC-075-FLOW Flow Meter w/ ¾ NPT threads 1" NPT 5"
HC-100-FLOW Flow Meter w/ 1" NPT threads 1 ¼"NPT 5"


Find a Hunter Distributor closest to you using our interactive lookup -  Get Hunter

For step-by-step instructions on installing the nipple to bypass the flow sensor, CLICK on this link: Flow Meter Winterization Bypass







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