What are these pool parts?

[440dodge440]

I'm cleaning out the pool cabinet and found these parts- Tis is my first year with a pool, so this is all new to me. I suspect a couple of these are automatic cleaners. The white one is made by Hayward, but no part number on it. The clear one does not have any manufacturer one it, and the gray thing says HTH and has a hex shaped hole on the other side (the picture I had of this won't upload). I don't have any use for them now, so I'm just trying to figure out if I can get rid of them or if they have any use to me.

Thanks

 

[Bama Rambler]

The clear one is a suction measuring device for setting the second one. You hook it to the end of the vacuum hose and adjust the blue knob on the second one (vacuum regulator) until it read within the square. As said before, the second one is a vacuum regulator.

 

[440dodge440]

Thanks!! I searched on the vacuum regulator and it looks like they're for a robot vac that the previous owner must've had. Do you know if there is any need for these on the manual triangle head vacuum?

 

[Bama Rambler]

Unless the head is "sticking" to the liner because of too much suction there's no need for them. I assume you're talking about a manual vacuum head.

 

[440dodge440]

Thanks again- yes, a manual vacuum head and it's not sticking to the liner....