I replaced the one on my 2012 210UDS. Pretty simple: https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
Get to the area on the camper interior behind the inlet; on mine it's accessed by removing the panel under the refrigerator. There are two hoses, the water and the vent hole. Simple hose clamps fasten them to the inlet. Remove them. On the exterior, remove the screws, remove the old inlet. If there's lots of butyl/putty sealant, heat gun might soften it up. Non-marring plastic type putty knife can be slid between camper and inlet to separate. Remove. Replace with the new inlet. Use butyl tape and dicor non-leveling/non-sag sealant.
BTW - if you overfill - water shoots out the vent hole. Ask me how I know?