what are the water connections at the back of the shower?

The water connections at the rear of the shower originate from the diverter assembly and have 15mm threads. Fitting flexible hoses onto this shower should then go onto isolation valves then feeding to the Hot and Cold water supply in the property. Ideally you should ensure that you finish your pipework around 1 Mtr from floor level in the corner for corner fitting showers, or in the middle of the shower, if you have purchased a shower that fits against a single wall. You must make the connection for the pipes with an 15mm Isolation valve