I always keep a lil square tackle box (10 x 14) with lots of O-rings 1/4 & 3/8,2 Water chucks, lots of couplings M/F, plugs,all sizes, Nozzles,for surface cleaners/wands,3 in 1 oil pen,a few picks,teff. tape, locktite, a cap light...........you get the point. if you are gonna turn up the heat dont be lazy change out your o-rings. Its cheaper that the hospital bill. I had a bad experience by being lazy blew the o-ring and coupling off the gun and lucky for me i was wearing a good rain suit and just blistered up a lil on my back.Make sure your hoses are rated for the heat too.