1999-7-20 · Closing one end of the 3m plastic tube : Photo 52. Fastening the closed end of the plastic tube with a rubber band . Photo 53. One end of the tube is closed : Photo 54. Placing the PVC "T" at the other end of the 3m plastic tube (one of the end of the "T" is joined to the hose coming from the digester and the other to the stove) Photo 55.