removable collection cup for DIY skimmer?

[dzeadow]

I wanted to do a 5" riser neck and 8.5" reaction chamber, but how do i make it so that the collection cup is water tight yet removeable? I wanted to get a 5" pvc union, but all I see is 4" max and they're really expensive. Is there any easier cheaper way to do the removeable cup? TIA.

[geoxman]

Make an acrylic flange and tap holes in it and use vinyl screws. Take a look at barraquatics

[SMOOTHIE]

Check out the plastic floor drains at the hardware store. May be big enough.

[dzeadow]

I was thinking that too at first, but I wanted the bottom flange to have an 8.5" opening and the top flange to have a 5" opening but still have the outer ring of the flange be the same to be able to seal them. I ordered 10" acrylic circles instead and will make my own. Thanks for the input guys.

[geoxman]

Make sure you buy a good tap-do not go cheap! It should run no more than $10. I went for an off brand a few years back and it snapped off in the plastic. Good luck with your build

[dzeadow]

thanks for the heads up. I'll definitely look into it, I'd hate to have that issue considering I didn't buy any extra circles. Any idea on how to easily make the key hole part on the top flange? Or would you just thread both flanges?

[geoxman]

I would use a router or have someone that is experienced with one make the key holes. If not you could use a slow drill press with two different sized bits.
Also make sure to buy bits that are made for drilling acrylic and not wood.
http://www.craftics.com/products.cfm?Category=87

You can probably get the nylon screws and tap there as well. good luck

[dzeadow]

cool, thanks.

[jgwhite]

I have used one of the thicker plastic cd or dvd cases that they come in.