Lost Bung!

I was getting my inflatable boat towable ready for the summer (this is a large inflatable mattress that you can tow behind a speed boat) only to discover that the mice had been at it.  A couple of small holes in the PVC are going to spoil the fun.  A quick dollop of Stormsure Flexible Repair Adhesive have fixed them in no time.
Worse, however, is the fact that the bung is missing. I can inflate it with no problem, but I cannot keep the air in! The bung has an unusual thread which tapers as it goes in. I have looked on line but found nothing.

Missing Bung
Missing Bung

So , I have made a new bung. I used StormForm. This is a hot water mouldable polymer. It comes in granule form. I put about 25 grams in a cup and covered it with boiling water.

 

 

 

StormForm
StormForm

After a few seconds it all melts into a thick flexible plastic. Then, with my hands I have moulded this into the rough shape of a bung. Of course it did not fit, but by remelting the StormForm and screwing the bung into the hole, I have managed to make a perfect screw thread.

 

After about 10 minutes I have an airtight bung again.

Success!

Hand Made bung
Hand Made bung