Made by Waterway
Part Number 418-3000
This hot tub pipe extender fits inside pipe to extend it by 26.4mm and can also be used to connect 1" vinyl pipe like a barb.
1" Hot Tub Pipe Extending Connector Dimensions:
1 end fits inside 1" pipe (26.4mm) and the other is the same external size as 1" pipe (3.2cm) which means it fits into a 1" fitting. The internal of the smaller size is the same as the internal of 1" plumbing which means you can stack these together.