Is this item drinking water safe? Yes.  Water flowing through your ELEY reels, hoses, and watering tools stays pure because we use only 100% drinking water-safe internal component materials. From the lead-free brass and rubber seals, down to the assembly lube—it’s all safe.  What is the inside diameter (ID) of the interior ball valve? When fully open, the interior ball valve creates an opening that is 14mm in diameter, (0.55 inches), or just over 1/2" Inside Diameter. What is the inside diameter of the bottom 3rd port? 15mm (0.59 inches) Can a ball valve be added to the bottom 3rd port to allow for adjustable flow rather than being always on?  Yes.  Any ball valve that is equipped with standard garden hose threads can be added to the bottom port so as to allow for on, off or adjustable flow through the bottom 3rd port.  Simply remove the brass cap on the bottom port and replace it with a ball valve of your choosing.  We would recommend considering one of the two ELEY in-line ball valves, either our #1117 standard ball valve, or our #1116 ball valve with a swivel fitting. Is the ON/OFF lever replaceable if I manage to break it? Yes.  You can purchase the item and watch an installation video by following this link.  Ball Valve Lever (Item 2961) Can this valve be used indoors under constant pressure behind my washing machine? No, It is not intended for indoor use.  Outdoor use only. Can I leave the Y-valve attached to a faucet in freezing temperatures if both valves are left open? We suggest removing all watering tool attachments from the spigot before temperatures drop below freezing as water can get trapped inside the valve body when the valve is fully open or fully closed.