Strainers or filters in cold water supply lines are commonly installed at the inlets to which appliances?

• A. Inlets to dishwashers
• B. Inlets to water heaters
• C. Inlets to dishwashers and washing machines
• D. Inlets to dishwashers, washing machines, and water heaters

Answer: (D)

Filters or strainers on the cold-water inlet protect the appliance by catching sediment and debris before it can enter the fill valve or internal components. Debris in the supply line can clog valves, reduce flow, cause misoperation, or lead to damage in the appliance’s water-using parts. Dishwashers, washing machines, and water heaters all have cold-water inlets that can be exposed to such debris, so placing a filter at each inlet helps ensure reliable operation and longer life for these devices. The other options omit one or more of these common protections, making the all-inclusive choice the best fit.