Features： 1、Sturdy Construction: The RV gravity water inlet features a 78mm inlet made of plastic shell and stainless steel inner core, features a bayonet style cap, spring and sealed ring design, leak proof and anti loosening. 2、Secure Locking System: Equipped with locking keys, this gravity water inlet is lockable and comes with 2 keys to prevent unauthorized access to the filling port, providing added security. 3、Convenient Dustproof Cover: Designed with a silicone dustproof cover, the RV water inlet includes a clean and convenient feature that helps keep the inlet free from dust and debris. 4、Efficient Water Tank Vent: With a 9mm water tank vent featuring a reverse venting design, this water inlet prevents the formation of vacuum in the water tank, making it easy to add water without hassle. 5、Easy Installation and Versatile Use: With a simple screw installation process, this water inlet can be used on various models such as RVs, campers, trailers, and cars, can be used for pressure water filling and quick water discharge. Specification： Item Type:?Gravity Water Inlet Material: ABS+Stainless Steel Installation Hole Size: Approx. 78mm/3.07in Interface Outer Diameter: Approx. 38mm/1.5in Interface Inner Diameter: Approx. 32mm/1.26in Suitable For Installation Thickness: 30-40mm/1.18-1.57in Package List： 1 x Gravity Water Inlet 2 x Keys 4 x Screws