I used these for the body of the
tank:
Curved Tip Syringe -12 cc
And I used these for the end plugs:
DANCO 3/8 in. Beveled Washers (10-Pack) These come in 3 outside diameter sizes (even though they are all labeled 3/8. The diameters are 5/8", 21/32", and 11/16") I used the 5/8" to fit the large syringe tubes. The center hole needs to be drilled/reamed out to fit snug on a BD 3ml syringe.
On the bottom, I have a piece of 3ml syringe that is about 1/16" longer than the thickness of the washer. On the top there is a piece of of 3ml syringe that is about 1/4"-3/8" longer than the thickness of the washer.
I'd post pictures if I can do it without having to use an image hosting site...is there any way to insert them directly into the post?