0.25 (1/4) OD Black Polyethylene Tubing

I’d love to give rave reviews but once I installed my new filters I had questions about pressure and leaking. It’s been a week since I emailed my question and I have yet to receive an answer:(

Using HD tubing, the clear thin Polyethylene, gave me a leak in my RO; I needed a longer tube for mounting my 6-stage chloro buster. I figured I would use the black RO tube instead. No leak. When you touch this side by side, the HD tubing is stupidly thin. And the colored tubing is cheaper here than local orange big box clear tubing. It sounds so silly, but it's true for a reason: I'll only buy Polyethylene tubing from spectrapure from now on.

I needed a input hose connector, a part that screws onto facet that has black
input hose. Is it possible to get this part?

0.25 (1/4) OD Black Polyethylene Tubing