Description: 78mm Gravity Inlet: Made of durable shell and stainless steel inner core, aging resistance, good toughness, not easy to crack. With Locking Keys: Lockable, with 2 keys to prevent others from opening the filling port. Silicone Dustproof Cover: Designed with a dustproof cover, clean and convenient. 9mm Water Tank Vent: Diameter 9mm air vent, venting design prevent the formation of vacuum water tank, easily adding water. Simple Screw Installation:It can be used on a variety of models, such ,Camper ,Trailer, , Cars. Specification: Material: + Stainless Core Diameter: Approx. 78mm/3 inch (hole) Inner diameter of the interface: 32mm /1.26inch Outer diameter of interface :38mm/1.50inch Air vent size :9mm/0.35inch Product Size: 118x11mm / 4.65x0.43inch Packing size :12x12x12cm/ 0.47x0.47x0.47inch Suitable for casement door thickness: about 30-40mm/ 1.18-1.57inch Package Includes: 1 Piece Gravity Water Inlet 4 Pieces Screws 2 Pieces Locking Keys Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!