I NEED TO BUY PARTS FOR MY STANLEY 61804N BACKPACK SPRAYER

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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Something like this?

https://www.amazon.com/Winters-Economical-Pressure-Internals-Accuracy/dp/B0087UCJ6I/ref=sr_1_7?dchild=1&keywords=stanley+backpack+sprayer+pressure+gauge&qid=1633991257&sr=8-7

It looks like the sprayer is made by Chapin and badged to Stanley.

https://www.google.com/search?q=Stanley+Backpack+Professional+sprayer+61804+parts

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Chapin makes sprayers. They have parts. Just give model #. Phone 1-800-950-4458. Located in N Y STATE. Pump rebuild kit is $25.00 Inc shipping.

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

I would like the answer yo that question

Drive out to the country side and look for a ACE or TrueValue hardware store. Bring your sprayer with you. They will likely have the right part for you in stock.

Got the same sprayer, can't get parts. Toss it in the trash like I did, don't buy anymore Gilmour products.

The picture looks a lot like a Solo sprayer I have. I wouldn't be surprised if Solo made them for Stanley. Do a search for Solo sprayers. They have a site. My sprayer is a Solo 425

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