A useful drain pipe adapter to unblock your sink without any chemicals or plunger. You can use this to connect a dishwasher or washing machine inlet pipe directly to your drainage (after the u-bend) to apply high pressure to your drainage pipe directly. Works much more effectively than any plunger or chemical. It applies pressure directly bypassing any possible return paths such as overflows.

Apply for short duration only an never leave unsupervised!!!

One side has a thread suitable for UK dishwasher inlet pipes. Make sure to close valve (if you have one) or all water input (if you don't) before disconnecting the dishwasher. The other end is a smooth 40mm pipe suitable for compression fittings. Likely there is a joint after the u-bend where this can be connected. See pictures for connection.