DIG PVC Compression Insert - Bulk PackDIGs 1 2 Compression PVC compression inserts are available for . 450 OD (red), . 630 OD (green). . 700 OD to . 704 OD (black), . 710 OD (blue) and . 930 OD (black). Glue the insert into any 1 2 or 3 4 PVC slip coupling or tee to connect it to 1 2 or 3 4 drip tubing. Features Fits polyethylene tubing with . 450 OD , . 630 OD, . 700 OD to . 704 OD, . 710 OD and . 930 OD Glues into the slip side of any 1 2 or 3 4 PVC fitting Color coded insert for easy