The bowl for the PA212503 filter/regulator is not sold separately.
150 psi is the max inlet pressure.
Short Answer: Yes. Longer: There is no mount included with this unit. The accessory mount can be installed in either direction. You can mount the pressure gauge in either hole, allowing air flow to go left or right from the unit.
Can NOT be found.
The default filter is 5 microns.
Yes, the pressure gauge is included - and can be attached to either side of the regulator.
There is no replacement part listed in the parts list or at Campbell Hausfield. But, you can try calling 1-800-543-6400 and see what they say.
No. I used the inlet and outlet pipes I added and used two pipe straps to mount it to the wall
The MT4309 has a regulator on the unit that controls the pressure going to the airline. We would not recommend using another regulator.
Plastic. Yes, it will eventually crack. It also states it is susceptible to compressor oil. Not a very good choice in plastics.