Duotight - 8mm (5/16”) Female x 5/8” Female Thread (suits Keg Couplers and Tap Shanks)

Duotight - 8mm (5/16”) Female x 5/8” Female Thread

The duotight 8mm (5/16”) Female × 5/8” Female Thread Adapter gives you a clean, reliable way to connect EVABarrier 8mm tubing directly to standard 5/8" keg couplers, tap shanks, and other 5/8" threaded homebrew fittings. It’s part of the latest duotight 1.10 design revision, engineered for maximum sealing performance in both gas and liquid applications.

Built with duotight’s signature double EPDM O‑ring sealing system, this fitting delivers twice the sealing surface of standard push‑fit connectors. That means fewer leaks, tighter hose bends, and long‑term reliability across your entire draft or brewing setup.

No clamps are required — simply cut your EVABarrier line straight, push it in, and enjoy a secure, gas‑tight connection rated up to 100 psi. To remove, press the collet in and pull the line out. Fast, clean, and tool‑free.

Thread Compatibility
This fitting suits all standard 5/8" BSP threads, including:

• Keg couplers (Sankey, A‑type, G‑type, etc.)
• Tap shanks
• Many other homebrew fittings using 5/8" thread

Why duotight? Double O‑Rings = Double Reliability
duotight fittings use two EPDM O‑rings per hose port, giving you:

• Twice the sealing surface
• Better resistance to gas, chemicals, and pressure cycling
• Superior performance under tight bend radii
• Long‑lasting, food‑grade durability

No other push‑fit system on the market uses dual EPDM O‑rings — this is why duotight remains the most reliable push‑fit technology available.

What is EPDM?
EPDM (Ethylene Propylene Rubber) offers:

• Excellent chemical resistance
• Compatibility with water, alcohol, oils, acids, and alkaline compounds
• Outstanding ageing and weather resistance
• Better gas transmission rates than silicone or vinyl
• BPA‑free, food‑grade performance

Perfect for long‑lasting brewing and dispensing systems.

Key Features

• 8mm (5/16”) Female × 5/8” Female Thread adapter
• Fits keg couplers, tap shanks, and 5/8" threaded fittings
• Double EPDM O‑ring sealing for leak‑free performance
• Suitable for gas or liquid applications
• Rated up to 100 psi
• No clamps required — simple push‑fit installation