I think I paid about $70 for the 6ft of 3.5" clear acrylic tubing that I got. Like I said, I got it from US Plastics.
Anyways, If there is a leak when joining the acrylic tubing to the pvc elbows, I use plumbers 2 part epoxy (thats approved for potable water applications) to seal the joint. This stuff only needs about 20 minutes to set, then its ready for use in the aquarium.
Some pvc/acrylic joints, if tight enought, don't need to be sealed at all though.
Here's a pic of the 2 part epoxy, sealing the tubing-
Anyways, If there is a leak when joining the acrylic tubing to the pvc elbows, I use plumbers 2 part epoxy (thats approved for potable water applications) to seal the joint. This stuff only needs about 20 minutes to set, then its ready for use in the aquarium.
Some pvc/acrylic joints, if tight enought, don't need to be sealed at all though.
Here's a pic of the 2 part epoxy, sealing the tubing-
