Economy Tennis Ball Barrel

Schedule 40 PVC makes a good Tennis Ball barrel. It is a bit thicker, heavier and stronger than SDR21. It takes a little more pressure on the low end for a given performance, but on the high performance end the trajectory height is the same as the thinner SDR21. Schedule 40 is more available than the very hard to find SDR21. Schedule 40 barrels take more pressure to force the Tennis Ball down the bore when preparing for launches.