Tamjets smoke system with components as shown in the photos. The larger tubes fit 4mm Festo connectors supplied together with a Festo push in Tee (there is also a barb brass Tee if you prefer that) and Festo/Tygon adapter. A nylon Tee is supplied for the tank side of the pump for a fill line. I used the smaller tubes to create smoke in a JetCat P120 powered model and there was plenty of smoke. The pump is smart in that it will not pump if your assigned Tx slider is not a zero when the model is turned on thus preventing diesel being pumped into your exhaust pipe. The pump requires a 2S 700-850mAh battery. Selling because I don't have a jet with room for a smoke tank anymore. The pump has been little used. PayPal add 3%.