I did not use a union for the gas valve Ok or not?

[JHNORTH]

I did not use a union for the gas valve Ok or not?

[Admin]

What is the model of furnace and type of CSST being used?

[Sergroum]

Pretty certain csst connections are not considered unions as they are not the type of connections that can be loosened and tightened infinite amount of times.

[NoDIY]

Furnace installation manual usually asks for a ground joint union.
Csst connections are not ment to be a union

[Porcupinepuffer]

Done it in the past before. You need a proper union. No inspector lets this slide.