Share this article
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 of 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 using one of two options.
| Installing Temporary Nipple to Bypass HC Flow Meter |
Installing a SCH 80 or galvanized nipple. See the size chart below for specific length needed:
 |
| Model | Description | Male-Thread NPT | Nipple Length |
| HC-075-FLOW | ¾" NPT body, male thread with 1" NPT male adapter | 1" NPT | 5" |
| HC-100-FLOW | 1" NPT body, male thread with 1.5" NPT male adapter | 1 ¼"NPT | 5" |
| HC-150-FLOW | 1½" NPT body, male thread with 2" NPT male adapter | 2"NPT | 11 3/4" |
| HC-200-FLOW | 2" NPT body, male thread with 3" NPT male adapter | 2 1/2" BSP | 11 3/4" |
| Installing Shutoff Valves to Bypass HC Flow Meter |
A second option would be to install PVC tee-ball valves on each side of the meter. This is the recommended option during NEW installation. The meter will have to be removed manually after the blowout to make sure any residual water is not sitting inside through the winter months.
IMPORTANT: The pipe bringing water into the flow meter needs to be a MINIMUM of 10 times longer than the width of the pipe. The pipe carrying water away from the meter needs to be a MINIMUM of 5 times the width of the pipe.
- Ball Valve 1
- Ball Valve 2
- Ball Valve 3 (Not necessary for winterizing but helpful for maintenance on the meter)
- Bypass PVC pipe
 |
Find a Hunter Distributor closest to you using our interactive lookup - Get Hunter