| MCA,
Thanks for the input. However, the problem with a 6x6x4 sanitary tee is that it requires sealing the bottom 6 inch opening as well as making a hole in the side of the tee for the air pipe. That would have to be a precise cut to prevent leakage even with PVC cement. With the 4x4x4 no additional holes are needed and the two ends of the tee are sealed with PVC fittings and cement, so no leaks.
Gary |