Description
The Duotight 8mm Joiner provides a quick and reliable way to connect two compatible 8mm OD beer or gas lines. It is a useful fitting for extending tubing or making changes to a kegging system.
Both ends feature 8mm push-in connections. Therefore, you can join two lengths of compatible tubing without hose clamps or traditional barbed fittings. The straight design also helps create a neat and simple connection between your lines.
Applications & Compatibility
- Connection size: 8mm (5/16″)
- Connections: 8mm Female × 8mm Female
- Configuration: Straight joiner
- Gas lines: Suitable for compatible 8mm OD gas line
- Liquid lines: Suitable for compatible 8mm OD beverage line
- Installation: Push-in connections require no hose clamps
For compatible tubing, pair this fitting with our Beer Line 4mm ID × 8mm OD or Beer Line 5mm ID × 8mm OD.
Duotight Generation 2
Duotight Generation 2 fittings use two O-rings made from different materials. First, the EPDM O-ring provides excellent chemical and gas resistance. Meanwhile, the silicone O-ring stays flexible at low temperatures.
Generation 2 fittings use Polyketone (POK) instead of standard acetal. As a result, POK provides excellent chemical resistance, UV resistance and durability for brewing and beverage dispensing systems.
Generation 2 Features
- Dual EPDM and silicone O-ring sealing system
- Durable Polyketone (POK) construction
- High chemical resistance
- UV resistant
- Rated to over 300 psi at 25°C
- Black collets identify the 8mm (5/16″) connection size
- Tube depth indicators help show when you have fully inserted the line
- Push-in connections require no hose clamps
For the best seal, first cut the tubing cleanly and square. Then push the tubing firmly into the fitting until it reaches the correct depth. To remove the tubing, press the collet in while pulling the line out.




