Old "Anthony" Style Skimmer main drain question

[newpool129]

Now this is just a thought but was curious on feedback. When winterizing Old Anthony skimmers I use the double plug. Closing with the double plug is a big gamble in hoping that the air lock holds for the main drain while making sure skimmer is blown out/antifreeze is in skimmer.

In the event of a freeze, wouldn't the ice force through the main drain and eventually just push water back through the drain? Random thought and not sure about ice formation etc. but love to hear others thoughts?

I'm just not convinced on this airlock method with the double plugs

 

[PoolStored]

Ignoring the double plug solution....

Do you have a diverter valve on the skimmer line before the pump?

If so, why not lower the water below the skimmer, blow out the skimmer, from the pump, for some number of minutes (5-10) to clear the skimmer line, then turn off the diverter valve to airlock the skimmer line. Then using a blowthrough valve in the skimmer to airlock the main drain?

Winter Pool Plug for 1-1/2 Inch Fitting, with Blow Thru Valve - # 10

This number 10 pool plug with valve creates a tight seal for a 1-1/2 inch PVC fitting. Includes a blow through valve for inserting compressed air into lines. Open stem plugs (or plugs with blow thru valves) use the same rubber, large wing-nuts and corrosion free materials as closed plugs except...

www.poolweb.com

 

[newpool129]

Thanks so much and that definitely is a possibility. Just curious to hear how people have done it with the double plugs and if they had any freezing issues with main drain?