Delrin is predominantly used on soft wall Nylon plastic tubing as a single use compression sealing sleeve
For a stronger single use metal sealing sleeve designed for poly-line applications, refer to the Fairview series 260-2 ~ 260-8
Do not use Fairview 60-2 ~ 60-14 series brass single use compression sleeves on poly-lines. The sleeves will cock sideways under compression and cut into your poly-line damaging it