You may want to consider buying the cheapest little 12 volt compressor you can find that has a regulator. Set it to 30 lbs and mount it in your utility bay where the hose will reach the water connection. Having a really easy way of blowing out the lines will make it a lot more likely you will use your rig in cold weather since re-winterizing becomes so easy. Our Norcold gas fridge icemaker can be easily gravity drained by removing the hose going up at the icemaker water valve. I have to access the back to remove the icemaker water feed line to blow it out, anyway. One less thing to have to clear of antifreeze later. I try to find everyway I can to "automate" tasks to make using the RV more likely.