There are two valves that rarely appear in a plumbing quote but that prevent expensive faults if fitted in time: the check valve and the pressure-reducing valve.
Check valve: stops water flowing back
The check valve prevents water flowing in the opposite direction to that intended, critical at the home's main inlet (so that water from the internal installation can't contaminate the public network) and at points such as the water heater or boiler, where improper backflow can damage the equipment. It is mandatory on the main connection under supply regulations.
Pressure-reducing valve: protects the whole installation
When mains pressure exceeds roughly 4-5 bar, it is recommended to fit a reducing valve right after the meter. Excessive, sustained pressure shortens the life of taps, flush valves, appliances and seals, and is a common cause of repeated faults that seem to have no explanation.
When to include them in the quote
In a new home or a complete plumbing renovation, both valves should be quoted as a standard item, not an extra. Their cost is low compared with the faults they prevent, and explaining it that way to the client helps justify the item without it seeming an unnecessary addition.
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