We have the Phoenix Faucets RV Bathroom Faucet # PF212307 which has the aerator nozzle that can be removed like I believe you are looking for. view full answer...
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The Camco RhinoEXTREME RV sewer hoses # CAM39867 will work great to dispose the waste from your RV to the camp sites main dump station or to a portable waste tank like the Tote-N-Stor # TNS25609. I wouldn't recommend staying connected to the dump or waste tank all the time though, this can cause "the business" to not drain properly because it will never have the right amount of water force to flush the solid contents of the holding tanks and it leaves the opportunity... view full answer...
We have tankless water heaters but I believe that would be more of a permanent install than you are looking for. If you are interested in a full replacement in that style a Furrion like the part # FR98SR would work great but if you were really wanting something smaller there aren't any options for that. The power consumption of a small electric water heater that would actually function would be too much for RVs. view full answer...