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great info from you guys. I was measuring the in and out duct for pressure plugs and started to look carefully at the cac. I saw some cracks thru a layer covering the upper joint and realized it was some sort of epoxy. It had cracked so I peeled it away and then saw a crack where the core meets the end cap.  I will try to send a picture but will not be able to work on this for a week or so.