I made one from stuff I purchased from Lowe's/Home Depot. I keep the pressure regulated at the compressor to 25-28. Easy, works perfectly, and I like to make-fix stuff anyway.
Get a quick connect of the proper polarity, a hose adapter of the proper polarity, and an adapter to go between them. Your adapter will look different than mine (I have quick connects on my hoses with different connectors so I cannot connect the dirty hose to the clean water connection) but the concept is the same.
2005 Winnie Adventurer 37B