HG Drain Unblocker Kit Drain & Plug Unblocker, Kitchen Drain Unblocker & Duo Unblocker Perfect combo for resolving blockages around the home. Drain & Plug Unblocker (1L) HG drain and plug unblocker is a product for unblocking a blocked drain pipe in a handbasin or shower trap. This liquid drain cleaner works thoroughly and effectively and does not affect plastic pipes. This drain unblocker liquid is a ready-to-use product, it does not need to be diluted, which means there is less chance of splashing. Kitchen Drain and Plug Unblocker HG kitchen drain and plug unblocker makes quick work of persistent blockages in the sink. The sink can become blocked because of rinsing away food remnants, fat and oil.