Problem could be as simple as a clogged aerator
6. Drain the system by opening all faucets and hose bibs. When the system is drained, remove and replace the valves under the sink. If the piping is threaded galvanized pipe, make sure to use a pipe wrench to stabilize the supply pipe while unscrewing the valve. This prevents possibly breaking the pipe threads in the wall.
If the supply pipe is copper, you may have to cut the valves and compression nut off, although we've had success using the existing nut and compression fitting with a new valve. This job rates about a "B" on the skills chart, so unless you've had some experience with copper pipe fitting, consider calling a plumber.
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