Can I run the SST20 unit without the prefilter

Precise Pressure Monitoring: The 0-160 PSI scale provides the high-resolution feedback necessary for fine-tuning HVACR pressure regulated systems

or hardening of the gasket material

By integrating this thermostatic radiator valve (TRV)

High Contact Rating: Rated for 10 amps at 24V

TE Connectivity KHAU-17A16-120 Relay 340793-762 Can I run the SST20The TE Connectivity KHAU 17A16 120 is a dependable 4PDT general purpose relay engineered for heavy duty switching in industrial and HVAC control circuits. Operating on a 120VAC coil, this KH series relay features a 4 Form C contact configuration with a 1A rating, making it an ideal choice for multi pole signals and low level logic switching. The unit is housed in a clear polycarbonate dust cover to protect internal components from ambient contaminants