Are All Main Drains Created Equal?

[elsie]

I guess the cover would have to rupture somehow (earthquake, or a shift in the ground), then depending on the GPM, it could hold a person to it?

How in the world do you close that drain to vacuum without diving down and manually closing it?

[Rangeball]

There is a valve before the pump that shuts off the main drain line.

[elsie]

How handy is that. My pool's about the same vintage, too bad it doesn't have one of those.

[Rangeball]

elsie, if you have enough exposed pipe between the ground and the pump, valves can be added, either DIY or paying a plumber to do it.