Knockout Sinks, Showers & Baths Unblocker 500ml A sodium hydroxide solution specially designed to clear fat, grease and hair in kitchen sinks, baths and shower waste fittings/pipework. Where kitchen waste disposal units are fitted or connection to a septic tank, use Knockout� Biological Drain Treatment.

Due to geographical locations we are unable to deliver to: Isle of Wight, Isle of Man and Ireland.