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The 1/2" will work but 5/8 is better. Clean a couple of roofs and then replace the hose with cash.

I run my 5850 Delavan with 1/2 in Blue Kuri tek hose tat I got recently from Lori at pressure Washer service. Give her a call. The hose is not expensive at all. I got 250ft. I believe it was way under $100.00 . They have got great prices. Here is their # 1-727-562-5488

im gonna start with the 1/2", master it...then move to the 5/8"...dont want to start out with too much flow and fill everyone's garden with sh...

cheers guys

Just keep in mind the higher gpm pump you go with the bigger hose you will want just because if you go up on a bigger gpm pump and keep the same size hose than why spend the money. Many years I ran the 5850 and finally went to a 5/8 hose and wised I did sooner. When I got the fatboy and used it for a while I still ran a 5/8 hose but then later went with a 3/4 hose and wised I did sooner. Now I run a yamada air pump and a 3/4 hose, pvc, ball valve and glad I do because the luv just go's further spreads faster. I do believe a bigger hose is better only if you have the proper pump pushing your gpm. Chris, Dave, Mike and many others will share that with you but also search and you will find what your looking for far as hoses and pumps.