Some home owners believe they can buy the plumbing fixures themselves and save cost. Things to consider would be that the plumber should be able to purchase at a discounted price and even after a fair mark up it should be less than retail.
On the flip side if the owner purchases the fixtures, they are now responsible for the warranty and need to pay the plumber for missing parts, extra time for broken parts or wrong parts, call back time.
In the end it is worth paying a fair mark up & let the plumber be responsible to have the right materials & warranty
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