I have a number of brand new quick connectors from the John Guest Speedfit range (www.johnguest.com/speedfit).They are great for making connections
for both plastic and metal pipes.

7 x 28mm straight connector
3 x 22mm straight connector
7 x 15mm straight connector
5 x 28mm-15mm coupler

Also a bag of extra O rings, seals and plastic pipe inserts. The connectors typically sell for $3 to $20 each but
willing to let go the whole lot at a much better price.
Please contact me if you are interested.