Shout-Out to McMaster-Carr
 

My build has been side-tracked for two years (due to shoddy workmanship by Coast to Coast that I have been repairing). In that time, my plumbing configuration has changed. McM-C allowed me to send back for full credit a bucket worth of plumbing parts (almost $100 worth). Not just store credit; full refund! Major props to them!

And if you are not familiar with them, you should be. You need it? They got it

https://www.mcmaster.com/#

Yep.. Great place. I use them for parts at work all the time..
While they might not always have the best pricing they are typically not too far off and just the shear variety of stuff they have makes it an almost one stop shop...

They are far superior to Grainger in all aspects... and usually MSC too..
Only thing Grainger wins in is because they have brick and mortar stores..

I have a Graingers about a mile from my house, just soooo expensive.