Alcadrain drain valve for 6/4" sink with an accessory for connecting sanitary appliances (washing machine, dishwasher or sink depending on the model). Complete set with suitable threads for reliable DIY installation. EAN barcodes. . A331. alcadrain. Product sheet. Length. 0.3 m. Diameter. 7 cm. Barcodes Typical use: Alcaplast Sink drain 6/4 70MM Overflow.