Reddit reviews American Valve Drain Cap
We found 1 Reddit comments about American Valve Drain Cap. Here are the top ones, ranked by their Reddit score.
Each Pack Contains One Small Cap 5/16-24 And One Large Cap 3/8-24Brass ConstructionFits Most Drainable ValvesBrand Name: American Valve
That's a "bleed" valve so you can drain the system for winter. Usually there's a removable cap there that screws on, that is what you need. Plumbing supply place will have them, maybe a hardware store but not positive. Look around, the previous owner may have left it somewhere conspicuous.
Edit: This is what you need https://www.amazon.com/American-Valve-DRAIN-CAPS-Drain/dp/B00IDCOF12