Yes - the screener is stainless steel with brass connector.
As long as the valve is under water, you should be able to position the valve as needed. My valve is mounted on a 45 degree angle.
Seems like plain npt. I cut and threaded a pipe and it fit good.
It's wise to use the strainer. It keeps the debris from clogging your pump.
2in pipe thread
We installed it in a 2” hose. It is 12” long
The spring is factory installed and does not require adjustment.
Due to the heavy metal construction, you can pressure wash the valve if needed.
Not that I'm aware of.
Holes are at least 1/8"