It’s $499 but what’s interesting is the adjustable pressure valve they have on it. Looks like it just plugs into the output side just like my 5.5’s have. Says up to 150psi. Watch the video and see it at about the 20 sec mark in video.
[https://www.northerntool.com/shop/tools/product_200820233_200820233]
I wonder how far that little sucker would shoot with some regular tips on it. That adjustment might be handy too when doing sealer or stain.