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Thread: Drain on main shutoff valve?

  1. #1
    DIY Junior Member Fraser Jim's Avatar
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    Default Drain on main shutoff valve?

    I am moving the main shutoff valve and the guy at Home Depot says that I need to have a drain, per code, on the new one.

    Does this sound right?

    Using a ball valve. Is there any politically correct side or direction for the handle to be facing?

    I.e. facing the pipe, handle lines up on the right side of the pipe facing up when open.

    Thanks

  2. #2

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    I am not 100% sure but I don't think it sounds right either but I could be wrong.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    If EITHER of his suggestions were true, then I have done THOUSANDS, probably tens of thousands, incorrectly. Use Home Depot aisle guy's advice when you want to know the correct nail, NOT when you have a plumbing question.
    Licensed residential and commercial plumber

  4. #4
    Home Builder ckl111's Avatar
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    I really depends on your municipality. A stop and waste valve is required around here and the inspectors look for it. It hardly adds anything to the cost of the valve. I never seen the use for the waste port on the main line though. For a hose bibb sure but it would take hours to drain the house lines through the port on the main shut off.

    A stop and waste valve will have an arrow showing the direction of the flow of water. Don't install it backwards or the waste port will be useless. Also try to install with the drain port facing down or at least sideways so the most amount of water will drain from it.
    Last edited by ckl111; 04-06-2013 at 09:18 AM.

  5. #5
    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by ckl111 View Post
    For a hose bibb sure but it would take hours to drain the house lines through the port on the main shut off...
    Most folk would open every faucet in the house as well as outside so would not "drain the house lines through the port on the main shut off".

    My entire plumbing is pitched to drain and I have strategically placed drains so that I could drain the entire system. Whether it is code or common sense is for you to decide.

  6. #6
    Home Builder ckl111's Avatar
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    Quote Originally Posted by LLigetfa View Post
    Most folk would open every faucet in the house as well as outside so would not "drain the house lines through the port on the main shut off".
    My point was that the drain port at the main valve has little value. To drain the system, you would open up the closest faucet to the shut off and not bother with the drain port.

  7. #7
    Forum Admin, Expert Plumber Terry's Avatar
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    the guy at Home Depot says that I need to have a drain
    Normally a main water shutoff does not have a drain. I've never seen a plumbing code that required one.

    A ball valve can be placed in any position. Unlike some types, it's just a straight pass through of the water.

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