I recently installed a new tap on the kitchen sink. The spray nozzle was attached directly to the old tap, but the new one does not have that attachment. Not to worry I thought, there is an extra connector on the under-sink water hose that i could screw the spray nozzle into.

The problem is that the under-sink hardware seems to be different than the hardware on a kitchen sink spray nozzle. I tried to find an adapter, but was met with blank stares from the well meaning staff at all the hardware shops I visited. The tap (3/8") underneath seems to have different grooves than the spray nozzle hose.

Has anyone has a similar issue? How did you resolve it?