Silicon Bottle Fitting Mold

This is a mold to create a silicone part. The part is used to create a snug fit between a generic fifth liquor bottle and a 1" to 1/2" PVC reducer.

There is a 2.5 mm hole on the top part for a 100 cc syringe that holds the silicone. The part is created with silicone liquid rubber, found here:
https://www.amazon.com/dp/B004BNF3TK/_encoding=UTF8?coliid=I3U08TEWZP9361&colid=1M713RC3LJ5EI