Features:
1. True Hi-Flow Design.
2. Hi-Quality Brass Material.
3. High Durability Nickel Finished in True Brass Color.
4. Design for Multi-Link Extension Application Via Acrylic Tube OD 14MM.
5. RoHS Compliant.
Thread: G1/4"
Thread Length: 5MM
The extra Oring is for the tube which OD is a little smaller, such as brass tubing after cutting.