The difference between a garden hose and a drinking water hose such as # CAM22823 is the materials and ratings each is made of. Some hoses have materials that contain lead or other materials that are not safe for consumption. A drinking water hose does not have those materials and so it can be rated for potable water. view full answer...
You are correct in that the Camco Seasonal Bypass Kit, part # CAM35713, has a hose shorter than 12 inches; it is in fact 8 inches from fitting to fitting.
For a longer hose, I recommend the Valterra Dual Valve Bypass Kit, part # P23504LFVP. It has a hose length of 12-7/8", so it will fit your application. An added benefit of this kit is the valve system: it makes the kit a permanent installation that you can adjust for winter, eliminating the need to uninstall it once spring comes. I've... view full answer...
The URL's you posted for for the same item so I'm assuming you meant to reference the Camco RV Drain Trap for 3/4" Diameter Drain Hose # CAM37262 and the Exterior Evacuation Drain Trap # 37295195.
Both of these drain traps are exactly the same with a standard 3/4" MPT water hose connection and 1-3/4" standard strainer connection. The only difference between the two is just the brand. view full answer...