... , surface white, corrugated with cuffs smooth Drain pipes used for air-conditioners features: 1) PE material, inside black, surface white, corrugated with ... - OD. 19mm and ID. 16mm - OD. 21mm 4) Used in the air conditioner as drain pipe Packing:ID. 14mm - OD. 19mm: 50m ... 40.5 x 23.5cm Sell Drain pipes used for air-conditioners.