Winterization fail - no water coming from jet.

Hello,

I hired a company to close my in ground pool last year.

The water jets in the pool have screw in covers for the winter.

It looks like on one of them - the guys must have had problems getting the screw-in cover on - so must have used a 'plug' in its place.

I just took the safety cover off yesterday to find the jet hole completely open (plug fell out over the winter).................

I hooked up the rest of the equipment - and turned on the water - to find that the other 3 jets are shooting out water very well.... however, the one in question is not shooting out ANY water.

In my head this feels like a broken pipe from freezing.

Please tell me there are other possibilities here!