I have a small water outlet hose that I'd like to connect to a 1/2" water connector that connects to the sink. The hose looks to be about 18.75mm in diameter and 3mm thick. I've tried a standard garden hose connector and the 16 and 20mm SmarteX P 1/ 2" Push Fit Brass Pex Male Connector but none of these fit the hose that was installed.

