you can safely use a 40 amp contactor to replace a 30 amp unit

The SP12234B features a standard 1/2" NPT inlet and outlet for compatibility with common commercial gas lines

Standardized NEMA 48 Frame: Ensures a seamless fit into existing motor mounts and belly bands for faster field installation

Broad Compatibility: Fits 1G

Tight Shutoff: Tested to meet ANSI Class IV standards

Reznor 197067 Gas Valve R-410A you can safely use aThe Reznor 197067 is an OEM 2 stage natural gas valve engineered for precision regulation in industrial and commercial unit heaters. Operating at 24V with a standard 3. 5" WC (water column) manifold pressure, this valve features 3 4" NPT inlet and outlet connections to ensure high capacity fuel delivery. As a service technician, you will find and recognize this part as the direct replacement for 195739, maintaining original factory specifications for