Permits flangeless instant connection. Larger end accepts tubing over O.D. range 4mm to 11mm, smaller end accepts tubing over O.D. range 0.5mm to 4mm. Large cap is Delrin, small cap is 1/4"-28 threaded polypropylene. Fluoron elastomer seals, bodies are made from virgin PTFE. PTFE cones for all-PTFE connections are included.