The 3/4 in. MPT 900 Series Compression Adapter connects to a 3/4 in. FPT connection point to 900 Series supply tubing or dripline (0.940 in. OD). Insert tubing into the gray compression ring, where an internal barb compresses into 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.