Many type of kitchen sink pipes and step to installation different to. There are explanation to install essential drain kitchen sink pipes. Lest read! The accessory you see in the image connecting the horizontal and vertical piping is called health T. The riser above the tee is ventilation, and kitchen sink pipes below the drain. The horizontal tube is the trap arm. The trap arm is connected to the trap, the trap is connected to the drain pipe and the drain pipe is connected to the sink. Limits the length of code tail piece to no more than 24 inches. Not shown in the picture is a test shirt, which has a screw cap allows you to access drain cleaning. He will be installed above or below the health-T. Kitchen drains kitchen sink pipes usually clog where the trap arm meets the sanitary tee, so installing a previous test tee makes it easy to remove any obstruction.