I spend the .99 on a coupler and just cut the tubing.

Yes you can although not recommended. The 1/4" drip line uses a 1/4" barb connector, tee, or elbow and that keeps it from popping out it might still happen if you have really high pressure. You need to poke a hole in the 1/2 line with a nail and the push in the 1/4 fitting of your choice and then the 1/4 line goes on. Here is a link that might be useful: do_it_your_self_site

spam

Understood Vith, but the small end of the reamer is 1.70 and the pipe opening is 1.50, it won't even begin to fit into the tubing. Here is a photo of the reamer, I must not be understanding something. Isn't the I.D. of 1-1/2" pipe and 1-1/2" tubing the same, 1-1/2"? I would think that a 1-1/2" tapered reamer would be around 1.50 at the midpoint of the taper. Here's a photo of the reamer. I know a plumber's reamer would be the correct tool, but I haven't been able to find one at an affordable price for my birdhouse hobby. I do have one of those red plastic hand reamers with 4 blades, but I thought this type would do a cleaner, easier job. Now it's more about curiosity, as I thought I understood pipe sizing.