Yes, a combined dispenser and valve assembly.
The "rear hose couping" is a while nylon bush which fits into the back panel, held with a screw. The cold hopse is screwed onto the bush as the back of the machine.
The inlet valve assembly fits into the back of the bush. I would have expected there to be a rubber washer type of seal but instead there are remains of what looks like hard mastic (hard white deposit which can be scraoped off with a screwdriver.
I hope that helps?
I think you are understanding the problem.
I would have expected the "bush" to be permanently fixed to the inlet value assembly. When I dismanted the assembly it was clear that they were not joined and that was where the water leak was coming from. I assumed at the time that the two parts must have broken apart, probably as a result of the water freezing in the assembly.
When the new inlt value assembly arrived today, it was clear that it was not in fact joined to what I refer to as the "bush"..Do you think silicon sealant will withstand the water pressure? As I say, the sealant used before is very hard.