gas line

I saw on a plumerparts posts comments that the gas engineer always used an inline filter on the gas line to the boiler due to debris. I’ve just had a new boiler fitted, is it a good idea to ask my installer back and pay for a filter to be installed or a waste of money as the gas isn’t that...

Can I install cross t fitting ( 4 way) close to gas meter at the “line to the house” before it enters to the house

I have an existing underground polyethylene tubing gas line. I want to tee off the line to supply a tankless water heater. Is there a fitting (perhaps a saddle) which would allow the line to be tapped at any point or is it necessary to go back to a connection point in the line (i.e., a union...

Gas line for dryer coming out of wall about 3" and runs about 2' along wall then elbows along furnace. Inspector failed and wants specs on stack washer/dryer. Will not return calls, not sure what to do. We took out water lines and vent - no washer/dryer for that room.