Now this end of the tube is completely sealed. In the diagram I said it was a 1" plug, but in reality it was a 3/4" plug that I sanded down to fit inside the end of this 1" pipe. You can't really tell in the picture, but I've glued on an end plug that is solid. This end of the pipe also needs to be capped off to seal it air tight. Of course safety and caution are top priorities when working around power tools and open cutting blades. I used some wooden braces to keep the pipe steady, and made the cuts by using one hand to hold the pipe on the blade, and the other hand to rotate the pipe slowly. The goal is to make a nice groove for the O-ring, but not to compromise the structural integrity of the PVC pipe too much. To cut grooves for the rings, I used a table saw, and adjusted the blade by holding the pipe flat on the table top, and lowering the blade until I could see that it would only cut about halfway through the plastic. The best way that I know of to make an air-tight seal, is by using some rubber O-rings. There is just a little gap, but we actually need this to be air-tight to make a proper piston. You can see here that the 1" pipe fits closely inside of the 1-1/4" PVC pipe.
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