Brand doesn’t matter afaik.
They are simple metal parts so they’ll last forever, unlike the plastic ones.
The rubber seals and o-rings are standard parts that can be easily sourced and replaced.
Grease can help seal them, however it also attracts dirt so not ideal.
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This one is rated to be used with Sulfuric Acid. Just in case you ever needed to do that lol
Sure, any farm store. Probably home depot as well. look for rubber hose. Mine are 3/4 inch and red.
https://a.co/d/7DUUAaI
Parker-Hannifin makes industrial products, these will do you the trick
We have a hose from the “Flexzilla” brand. I’m not sure if it was any amazing deal or anything, and we haven’t used it heavily I guess, but it has lasted four seasons with only sun-bleaching to show. Traditional garden hoses never lasted that long for us.
If you search for ‘Fiber reinforced hose’ you should get something comparable (cheaper than anything that’s labelled ‘military grade’ and fit for a lot of water lines PVC is decent and cheap, but if you’re using it for drinking water try and get something that’s silicone, just for safety’s sake