Use the 3/4 in. MPT 800 Series Compression Adapter to connect to a 3/4 in. FPT connection point to 800 Series supply tubing or dripline (0.830 in. OD). Tubing is inserted inside the black compression ring, where an internal barb compresses the tube to hold it in place. This compression fitting is made of ABS plastic and treated with UV inhibitors to prevent fading and cracking.