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You can weld poly fairly easily. You need some welding rod made of the same material you want to weld then a hot air welder ~$99.00 or any hot air gun that you can control the temp and funnel to a small 1/4" diameter jet. Heat the joint a little, touch the rod and when it is sticky start pushing the rod and moving the heat. email me at [email protected] for more detailed explanation and sources for tools etc.