1. Designed for the gravity water inlet of the water tank of the RV water system. 2. 1 or 2 inch vents, draining the tank air when adding water, it can quickly fill the tank. 3. Durable with sturdy plastic. 4. Lockable, with 2 keys for safe use of water. 5. Spring and seal ring design for leak proof and anti-loose. Parameters: Colour:White Material:plastic Incision diameter: about 85 mm or 3.34 inches Size:12 x 12 x 9.2 cm Package Contents: 1 x RV Water inlet 2 x keys Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store