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.[/section] What type of threads are on the nozzles and gun? All threads on this product are 3/4-inch Standard Garden Hose Threads (GHT).  Accordingly, both the gun and the nozzles can be directly threaded onto any standard garden hose or watering tool.  Virtually all garden hoses used in North America, (whether 1/2-inch, 5/8-inch, or 3/4-inch) are equipped with threads that are 3/4-inch GHT.  What is the grip made from?  I have a contact allergy to rubber. The rubber grip material is thermoplastic vulcanizate, (TPV).  Santoprene - Wikipedia