Just a quick question.

You need to complete the question!

Check valves on sewer lines are never good idea. Why did you have it installed in first place ?

What was the cost

Sorry Zhuzhu, but we don't estimate prices online here as each area of the country has different pricing schemes.

If you are unsure of a local plumber's pricing on a job, call in one or two more for a free estimate and see what they can do for you, OK?

Good luck!

Mark

Hi stokvis and welcome to The Plumbing Page at AskMeHelpDesk.com
It goes like this on The Plumbing Page. You ask a question and we give you a answer, But you got to ask a question first,
And zhuzhu what has the cost have anything to do with this thread? Why are you concerned with the cost? Just curious, Tom