Here is a suggestion about a regulator, water hose, filters and conditioners.
RV Water Filter Store
Regulators The Regulator I use is the Watts Adjustable 263A Regulator,
2" diameter 0-160 gauge, 4-4.5 gpm.
http://www.rvwaterfilterstore.com/images/Watts263AwGauge.jpg
Water Hoses
The water hose is good up to 200 psi. You can get brass or stainless steel fittings. The water hose does not kink. You can order it in any length.
I bought these water hoses. 36ft hose, 15ft, 2-3ft. The 36 foot will be long enough to reach most faucets. It seems that a 25ft is just a little to short for some. The 15ft is an extra hose but just in case I get a site where I have to connect to a faucet all the way over to another site.One 3 foot is used to connect from the UDC to the water filters. The second 3 foot is to connect to the water faucet. I found a couple of campgrounds that had the water faucet in a place I can not put the regulator or a Y connector on, but if I have the 3 foot hose I can bring the connection to a place I can hook my water regulator.
I had 2 water filter jugs break on me and flood the basement of the trailer. It is also a lot easier to winterize the trailer if the filter is not built-in. Water filters I got to a Lowe's. Westinghouse with clear jugs. I connected them togeather and put a white 20 micron filter then a charcoal 5 micron in that order from the shore post.
I would also use their 90* quick disconnect in the UDC and cheap quick disconnects from Wal-Mart.
FWIW
BC