I like this poly spray gun.Poly Spray Gun Viton #87089830 for Sale Online | Trigger Jet Spray Guns | Chemical Spray Guns | Power Washer Accessory | Pressure Washer Part | Spray Gun | Power Wash Store It has viton seals and seems to hold up really well. I have tried the cheaper ones and they leak. I like having a trigger over just a ball valve. I do put a ball valve on the base of it when I’m moving around and don’t want a accidental discharge.
As far as hose, I do what @Racer does and definitely make sure you have a stabilizer.
I bag the downspouts. I have 1000ft roll of 6 mil by 8 inch poly tubing. ULINE - Shipping Boxes, Shipping Supplies, Packaging Materials, Packing Supplies
I make 10ft long bags. I tie a knot on one end and then attach to the downspouts using gear ties… https://www.homedepot.com/p/Nite-Ize-18-in-Gear-Tie-in-Black-2-Pack-GT18-2PK-01/203210714?MERCH=REC-_-PIPHorizontal2_rr-_-203210990-_-203210714-_-N
If I have woods or an area that I can safely divert the runoff to, I just cut a tube for that.
I also use gypsum when I remove the gutter bags and have completed my application. .
