I had to install a Rheem natural gas water heater in my house because the old one started leaking. I bought the new one from Home Depot homedepot

https://www.homedepot.com/p/Rheem-Per...

Knipex:
https://www.amazon.com/gp/product/B00...

Knipex:
https://www.amazon.com/gp/product/B00...

Pipe Thread Sealant:
https://www.amazon.com/gp/product/B00...