PEG Pneumatic Push In Fittings Air Hose Reducing T-piece Tees Adapters Connector
The LEGO Bakery: Connector Pegs.
How to replace the feeding connector on a Corflo PEG Tube
PE PU PU PY PW Air Connectors 4 6 8 10 12mm Pneumatic Fitting Quick Connect Tee 3Way Plastic Pipe Water Hose Tube Connector (Color : 6mm, Size : PE or PEG) :
LEGO Technic Pegs and Connectors Starter Pack (472 pcs)