Anchoring rings 2 models

Solid foam rings in 2 models for 2 functions: Ring 38x15mm with a gap of 12mm which is to be pushed back to the hose, to the well bore where the hose running through it, to be sealed, so that there is no water goes down through the borehole, and a model 38x15mm ring with a hole of 30 mm in order to clamp an lED at the top of the borehole.
Choose your size above.