BP water bowls for racks

[Adam Chandler]

I use 4" PVC couplers and deli cups.

PVC:
http://www.lowes.com/pd_24130-676-4P...7C1&facetInfo=

Cups:
http://www.tsksupply.com/products/Pr...N-PUNCHED.html

Works great, and no tips.

Any difference between the clear and semi clear as far as quality? Or just personal preference?