I suggest you check with your local white appliance engineer but I don't think you will have any difficulty sourcing the parts you need from your local plumber's merchant, motor factor, hydraulic specialist or motor accessory shop, depending which way you want to do the job.
You could, for instance, make a small two-port manifold from standard tap connectors, elbows and copper water pipe if you want the result to be workman-like and substantial or alternatively fit a tee or "Y" junction into your cold water hose and then shorten a hot water hose and connect to the unused branch of the tee. It will need to be a neat and secure job especially if your cold water pressure is high; in order to avoid floods.
The tee or Y should be brass or nylon to prevent corrosion and preferably have a barbed surface and good well-fitting clips should be used to secure the hoses. Good quality plastic fittings are difficult to source and brass fittings equally so. I suggest having a look around locally and take a cut hose with you to show the guys what sort of size you are seeking.
You might eventually decide to make the manifold which will be a satisfactory and permanent solution. A pressure reducer might be needed in the "hot" water supply and a standard type would fit into the 15mm copper pipe.
Answers & Comments
I suggest you check with your local white appliance engineer but I don't think you will have any difficulty sourcing the parts you need from your local plumber's merchant, motor factor, hydraulic specialist or motor accessory shop, depending which way you want to do the job.
You could, for instance, make a small two-port manifold from standard tap connectors, elbows and copper water pipe if you want the result to be workman-like and substantial or alternatively fit a tee or "Y" junction into your cold water hose and then shorten a hot water hose and connect to the unused branch of the tee.
It will need to be a neat and secure job especially if your cold water pressure is high; in order to avoid floods.
The tee or Y should be brass or nylon to prevent corrosion and preferably have a barbed surface and good well-fitting clips should be used to secure the hoses.
Good quality plastic fittings are difficult to source and brass fittings equally so. I suggest having a look around locally and take a cut hose with you to show the guys what sort of size you are seeking.
You might eventually decide to make the manifold which will be a satisfactory and permanent solution. A pressure reducer might be needed in the "hot" water supply and a standard type would fit into the 15mm copper pipe.