[Dick]

Just do an internet search. I have bought the bulk of my fittings, manifolds, shut off valves and solenoid valves from WW Grainer and Amazon.

[Chas]

Jon: Do you have a favorite brand/manufacturer? Or a brand/manufacturer you tend to stay away from?

Anyone else can respond as well as so moved.

[Archived]

I do not have a favorite brand. When I was in another life developing products for the medical industry we used a lot of Asco valves, but solenoid valves are almost a commodity now so I just shop price.

I do look for the required characteristics. I may want normally closed or normally open. I might want continuous or intermittent duty. I want a voltage to match my application and if used for a specific material, air, coolant, water, fuel etc. I want one suitable for that purpose. The one I use to regulate coolant flow to the HW tank is rated 24 volt DC, continuous duty, high temp (up to 100 degrees C).

Solenoid valves are available from a lot of sources and some are reasonable and some are off the charts expensive.