Originally Posted by YLK

I have the same problem. Was about to start the repair after
buying the brass male barb hose fitting until
I found the following plastic knowledge base article...

Can you thread plastic and metal NPT fittings together?
www.usplastic.com/knowledgebase/article.aspx?contentkey=803
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To be able to thread plastic and metal fittings together the male fitting has to be plastic and the female fitting has to be metal.
When fittings with a tapered thread such as NPT are tightened the male fitting is compressed and the female fitting is stretched
(tensile stress). In general most materials have a higher compressive strength then a tensile strength. This is why the female
fitting is the one that will crack when over tightened. Therefore the female fitting must be stronger than the male fitting. Metals
are stronger than plastics. The female fitting has to be metal and the male fitting plastic.
Please note that mixing metal and plastics is not highly recommended and should be avoided if possible.
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Also, plastic expands/compresses with temperature variations of the engine area.

Seems like precision is essential when performing this fix.
Do "not" over-tighten or crack she goes.

Hmmm...[/QUOTE}

Well, you're not joining a metal and plastic npt fitting. The plastic on the resonator box is quite sturdy. I haven't had any problems with the fix. I suppose you could substitute a plastic fitting, but it might be more of a challenge to install.

Originally Posted by aptoslexus

I didn't use a thread tap. It's not a bad idea though. If using a plastic fitting, I would definitely tap it.