I have a Stanley Lawn and Garden Deluxe Steel 2-Gallon Sprayer 74020 that will not pressurize. You can hear air coming out around the handle.

Question edited for clarity.
Question moved to correct Stanley category.

Amazon or Sprayer-Outlet

https://www.google.com/search?q=top+seal+gasket+for+a+steel+STANLEY%2C+2+gallon+garden+spraYER

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Hi Chris:
Seems a bit extreme to consider using the 12 gauge. I've found that a .22 works quite well. (Humour)
Hint! Pressurized tanks must have the pressure relieved BEFORE the lid can be removed.
If the lid has been over tightened or has stuck, you'll need to get more leverage to unscrew it. Sometimes a rag wrapped around it is all it takes.
You can also try pouring hot water over the cap. Lay the tank flat so the rim of the cap gets the heat. Wrap an old towel around it first so it gets a good hot soak.
Should come off without the artillery.
Cheers

Try this site https://www.chapinmfg.com/

Good Luck

I would like the answer yo that question

If you turn the top (fill) handle it should release the pressure. Sometimes you have to also pull the trigger at the same time you turn the handle.

I had the same problem and had to take apart the handle portion and found that there was something in the line at that point. After cleaning it I had the same pressurse as when it was new.

buy a new one not worth reparing

Is it possible that the pick-up tube inside the sprayer is clogged up, or the hose it damaged? Maybe dirt in the spray handle/wand?

http://www.alamia.us/Solo_Sprayer_Parts_s/814.htm?gclid=CNvasPXY1ZsCFdVL5Qod3U4hJw

Hose end sprayers are the simplest and least expensive of the category. A sprayer jar is attached to a regular garden sprayer. Concentrated material is added to the sprayer jar. An adjustment on the jar determines the amount delivered. The force of the water through the hose pulls the material up from the jar and mixes and dilutes it with the water. A built-in anti-siphon device prevents unused material from being pulled back into your water supply. Compression or tank sprayers are the most common type of spray equipment. Concentrated material is added to the tank. Water is then added to a marked fill line. The remaining air is pressurized by pumping the handle a designated number of times. A control lever on the wand controls the spray pattern and amount. Compression sprayers provide a precise, on target, non-drift spray good for soil and lawn pests. Adjust the sprayer for a coarse, drenching spray, a concentrated stream or a fine mist. Tank capacities range from 1 quart to over 3 gallon for handheld models. Homeowner type backpack sprayers hold up 4 gallons. The tanks may be made from polyethylene plastic, galvanized steel or stainless steel. In addition to treatments for pests and diseases, compression sprayers are designed for applying cleaning solutions for decks and siding. Backpack sprayers are operated in the same manner as the handheld compression sprayer. The over-the-shoulder configuration makes it easier to carry the heavier load of material. Some backpack models also use a lever-style pump to maintain pressure without removing the unit form your back. Powered sprayers rely on a gasoline engine for spray power. Great for larger yards or gardens due to portability and capacity (12 gallons). Dusters are a slightly different breed. Dry powders (mostly for blooming plants such as roses) are added to a canister and applied by manually pumping. NOTE: Compression sprayers deliver liquid under pressure. Compression sprayers are powerful and efficient tools. This fact also makes them potentially dangerous. Always read the manufacturer's instructions and safety precautions carefully.