In cab air duster gun

Can anybody tell me how I fit the air duster gun to the airline under the seat. I’m driving a MAN TGX26.440 I’ve found the airline under the seat it has a t piece and one side has been blanked off. Can I fit it onto that or do I need to cut the airline? If so do I just push the pipe into the t piece that came with it. I’ll try and add some photos so you can see what I’m trying to explain.

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I’ve sorted it.

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