thanx for the comments guys.

The permanent bottom cap is called a test cap. it fits flush to the hole and you knock it in with a mallet.( i also epoxied that to make sure)
the cap on top is just your average pipe cap from the hardware store. it is made from ABS plastic.
i got everything i needed for it at the hardware store(OSH) but home depot has all of this as well.

about the length,diameter, and weight:
LENGTH: varies greatly depending on what rod your building it for.
this one is about 1 inch over 4 feet long. im putting a 2 piece 8foot fiberglass rod into this one.
DIAMETER:1 1/2" pvc schedule 40
WEIGHT: 2pounds 6 ounces with no rod in it.and2 pounds ounces(glass rod included.

thats pretty heavy. but it will work for me because all it has to do it lay around in my room or go into the car to go fishing! but i couldnt find the same tubing joe valencic is talking about, i looked but to no avail.

joe,
i saw those threaded caps but though they were a little overkill for what this tube will be doing. and yes i did read that thread a while back, nice job!