Horse Boarding & Stables in Huntington Beach, CA

For gaskets brewerygaskets.com Yeah the site is old, but their products are great, they stock pretty much every gasket you can imagine. And they'll custom make ones if its something really weird. They carry some small parts too, but not a ton

Glacier tanks and brewery gaskets as others have mentioned. Don’t use GW Kent unless you can’t find it anywhere else... $$$

I use brewershardware.com for just about everything. They usually have the best price for SS bits and pieces.

Glaciertanks.com Probably not the cheapest place in the world, but the prices are fair and I have never, ever gotten anything that close to being out of spec or subpar. Compared to other suppliers you sometimes get different thickness gaskets, crappy welds, etc. They also have odd connectors and bits that are helpful.

If you’re in an area with industrial food processors, there might be a local supplier that stocks the parts you want but doesn’t market to breweries. There are a couple places like that in Toronto / Mississauga.

Duhig Stainless is a subsidiary of Wolseley and they work with Alpha Laval and a few other suppliers for stuff. Great customer service from Rob Davis over there. They carry manway gaskets as well but as has already been stated, Dwight Clark at Jet gasket is the king when it comes to rubber.