In that case, adhesive is best.
There are thousands of plastics and hundreds of ways of putting them
together. Then there are plastics that no adhesive will stick to. Some
can be heat welded, some can be solvent welded. some are just tossed in the
trash can. Try duct tape.
There was some helpful (to me) info on this earlier thread ...
'How to identify type of plastic, then repair',
(Link broken to multiple lines, to fit posting rules. You might do
better just googling the subject line.)
Posters there suggest several glue ideas. Myself, I've never had any
luck with glue, but that may be a personal issue.
And, though I suspect this won't apply to your case, I have successfully
'welded' HDPE plastic car parts, using a soldering iron. If you do try
heat, use plenty of ventilation.
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