I found this knob on a copper pipe under my sink, and I'm not sure what it is. Could it be a shut-off valve that's missing its handle? Here's a picture for reference: https://imgur.com/a/O4sivsA.
1 Answer
Yeah, that looks like a ball valve without a handle. It's possible it was removed on purpose to prevent it from getting turned off accidentally when things are tossed under the sink. You can usually find replacement handles for around $15—just make sure to get a set with various sizes. No need to attach it permanently if you just keep it handy.
Haha, or maybe your sink is haunted! But seriously, that sounds about right.