Volcano Drain

this is a clever devise, and it worked for me

This is a clever devise. It enabled me to drain my water heater overflow pan into my sump pit while preventing radon from escaping from the pit through the empty drain pipe. The cost was reasonable. My one complaint is that pictures did not make it clear how I would install the drain. I had to hold it in my hands and visually inspect it to figure out how I would use it. To market this better, you need to include additional photos of the product....photos from multiple angles.

Excellent product / easy to install

After looking at Dranjer valves and not being able to see someone actually use it, I looked for other options that would allow water to drain through the sealed sump pit cover while keeping the suction seal from the Radon mitigation system. It was easy to understand how this drain works and how to install it. It's a simple design with proper function. The video demonstration of its function was also very useful.

Not that good