I would recommend weld-on #4. It will give you a good working time an a very strong bond, provided your surfaces are flat. If you're gluing any PVC thru the tube, you might want to try weld-on 16. Weld-on 40 is areal pain in th ebutt to use, costs more, has a max 1 year fridge life and you need to mix in the correct (difficult to measure) ratios.
For your needs #4 will be more than enough
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Brad
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