... , inside black, surface white, corrugated with cuffs smooth Drain pipes used for air-conditioners features: 1) PE material, inside black, surface ... : ID. 14mm - OD. 19mm and ID. 16mm - OD. 21mm 4) Used in the air conditioner as drain pipe Packing:ID. 14mm ... .5 x 40.5 x 23.5cm Sell Drain pipes used for air-conditioners.