O.D. tube size. Sold by the bag and also in bulk.
Jones Stephens 4 In. x 4 In. Schedule 40 DWV PVC Saddle Tee Kit
CRIMP TOOL 3/8 - 1 IN MULTI HEAD
Pex B Ratchet Clamp Hand Tool
Genova Products Poly Insert Combination Tee 3/4-in
Genova Products Sch. 40 PVC-DWV Reducing Sanitary Tee