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Old 08-08-2008
TheFrog TheFrog is offline
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I have been working in and around injection molded plastics for 15+ years. To the best of my knowledge there is no adhesive that will reliably bond with polypropylene. There are ways to weld polypro using scraps of the same material and a low heat soldering iron but the strength never equals the original.

I think your best bet is follow the previous suggestion of cutting off the broken part and fitting in a new nipple. However, this may also lead to problems as the plastic may crack due to the hoop stress associated with NPT fittings...

You are in a tough spot.
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