Solo 475 B Professional Diaphragm Pump Backpack Sprayer 4 Gallon

Easy to use, well built, good materials. This beats little squeeze bottles all hollow. You work the the lever a few times (very easy, no strain, comfortable) and the unit sprays for a long time. Really, it is effortless and you can cover a large area fast. There is no leaking whatsoever. They could have made the various tips for the nozzle easier to put on and off; you have to disassemble the tip a bit and a simple screw on/off would have been far better. That said, I think there is only one nozzle you will ever need, the one that sprays a flat fan shape. Don't know why, for example, anyone would want to spray a _stream_ of weedkiller. I fill the thing with it sitting on a table so that I can slip into the straps easily and walk away with it instead of bending down to get into it. For what it's worth I bought a knockoff of Roundup from Amazon and it gives excellent results. That would be Compare-N-Save Concentrate Grass and Weed Killer. The products are virtually the same chemically. The 4 Gallon Professional Backpack Sprayer is capable of producing up to 60 psi, with a high-performance connecting rod-actuated diaphragm pump system. The diaphragm is made of top quality material for its resistance to harsh chemicals, including bleach and for its long life expectancy. For spraying large jobs or small it is capable of performing virtually every spray ring task and will easily and effectively handle disinfectants, fungicides, herbicides, insecticides and fertilizers. The 475-B is designed with the ability to pass small abrasive particles without damage to the pump system and may be used with water from wells, lakes or rivers, which may contain sediment. The diaphragm backpack is ideal for handling chemicals in wettable powder form, liquid formulations and bleach solutions. Note:It takes initially at least 20 – 22 pumps of the handle to fully pressurize the sprayer.  Once pressurized, the user can spray for approximately 1 minute before the pressure starts to drop.  Pumping the handle 4 – 5 times will bring the sprayer back to full pressure.  As the pump handle attaches to threaded pump shaft with two cap screws, there is no need for locking nuts to secure the pump handle.  Easily and effectively handles disinfectants, bleach solutions, fertilizers, herbicides, pesticides and formulations for tree, shrub and plant protection. High-performance diaphragm pump for use with wettable powders, liquid and bleach solutions. Passes small abrasive particles without damage to the pump assembly. Produces pressure of up to 60 psi. Diaphragm is made of top quality Tivilon material to provide outstanding resistance to harsh chemicals. Interchangeable pump handle for left or right-hand operation and 48" nylon-reinforced high-pressure hose for extended reach. Four-nozzle assortment for multiple spraying tasks: adjustable, fan spray, hollow cone, and jet stream nozzles. TeeJet compatible. Followed the instructions, most important check for leaks with water initially including tank,wand and hoses prior to pouring in chemicals. Works great I applied a blanket spray of Tenacity much easier quicker without having to stop and pump handle. Price is very good I would buy again. Also not storing chemicals in the tank is a must. Solo 475-B Professional Diaphragm Pump Backpack Sprayer, 4-Gallon