You can buy clear PVC pipe (special order through Home Depot) and then cap it or thread it. Some places that make central vacumes also sell sections of it which is nice becuase they thread the ends. If you are near a pool shop some water filter tubes also fit the bill but are a bit more $$ then the clear PVC but come threaded with end caps and a water tight seal (o'rings and such). I assume this is for a res or to show your fluid levels in a none clear res?
Just this quote from that thread will be sufficient though I think:
johan851 said:
The best place to get tubing is from www.mcmaster.com. They have Clearflex 60 (the best) listed under Chemical PVC Tubing on Page 85, if I remember correctly. It's $0.65/ft for 1/2" ID 1/8" wall 3/4" OD tubing.
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