Something I never knew, maybe you didn’t too!

It’s not very often I have saved the heater nipple off an intake manifold. But today I was able to spin this one out. I never knew there was a filtering screen in these! Maybe not all have them but this one does and it’s almost plugged off. Likely restricted flow through the heater. Is this a aftermarket addition or did this come from factory? It was in a 1975 318 2bbl engine.

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I am guessing aftermarket since I have never seen one with a screen.