Gardena Below and Above Ground Drip Irrigation Pipe - 50m with Master Unit - Gardena 1389-20 Ref: GRD1389-20 Supplied completely ready for connection with Master Unit 1000, End-piece and T-piece. Length 50m. Water release per head 1.6 l/h. Pipe internal diameter 13.7 mm. Max. Drip Irrigation Pipe length 200 m (when Master Unit fitted in the middle). Price: £67.41 (Including VAT at 17.5%)