ASSEMBLING ROUNDUP BACKPACK SPRAYER

Roundup Pro
And for tough-to-control, or dense, annuals mix a solution of 2 ounces (4 tablespoons) herbicide to 1 gallon of water. Woody vines and dense brush need 13ounces (26 tablespoons) diluted in 1 gallon of water to kill them; apply to leaves in late summer for best result

leaking filler cap seal

Release the pressure, push the handle down andturn it to the left.

I've found buying one thats too big and cutting it to size and shape works best on my sprayer. You could go for a sheet of rubber and cut it all out with an exacto knife too.

Howdy g5483,Most reputable retailers' will either let you exchange the sprayer or get you the part. At The Home Depot we will gladly do either one to get you what you need.
Coach Dave

Check under the lid/cover for a rubber gasket. This may have gotten unseated when putting the sprayer top on. It must form a tight seal around the lip of the sprayer top in order to keep the pressure. Alternative: Put water in the sprayer leaving some air on top to build pressure. Put a few drops of dish soap inside and gently stir. Put the cover on, and tilt the sprayer to coat all areas at the top. Start pumping and see where the bubbles come out---there is your leak. If it is near where the sprayer hose enters, and it is a permanent mount, you may have a bad seal. If the sprayer hose unscrews, you may need a new rubber washer inside. If bubbles come out of the wand, or other plastic seams, you may have a crack in the plastic. Depending on the location, you could epoxy over the crack to seal it permanently. Good luck.

it should tell you on the induvidual bottles/cans of weed/grass what proportions of liquid/water to use.

Hello,
Yes I do use it, you can put about 1qt of round up for every gallon of water. This should kill your weeds, for most precise mixing instructions check the bottle label.
Thanks.

Hi.
roundup branded tank parts/repair kits can be found here Amazon com roundup sprayer parts Just click on the link and choose one (which fits our budget, model etc...)
I hope this was helpful.
enjoy

I have a 425 that I have had to remove the pressure cylinder. I found this on the internet one time, but can't find it again. Anyhow, this is how to remove the pressure cylinder on a Solo 425. Do all the disassembly instructions in the owners manual. Then get a short 2x4 or 2x2 and place it on top on the pressure cylinder through the opening on top of the tank. Then give it a good whack with a hammer. Don't be shy, that ****** is in there. It may take more than one whack. Once you have the cylinder out there is a screen on the cylinder that must be cleaned. To re-assemble, turn the sprayer upside down, insert the pressure cylinder, lay the 2x4 across the bottom of the cylinder and use even force (and hammer) to force the cylinder back in. Stop when you get to the O ring seat and you can do the rest by hand, being careful not to pinch the O ring. I have had Solo sprayers for many years and think they are great. But when it seems that when I leave glyphosate (Roundup) in the sprayer it clogs the screen. My hard water may contribute to the problem.