Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.

duotight – 8mm (5/16”) Female x FFL Female Thread (to fit MFL Disconnects)

$3.95
$3.95
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Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
  • Looking for high quaility push in fittings that will seal tight?  duotight are the push in fitting with superior sealing capacity due to the double o-ring sealing design.
duotight – 8mm (5/16”) Female x FFL Female Thread (to fit MFL Disconnects)

duotight – 8mm (5/16”) Female x FFL Female Thread (to fit MFL Disconnects)

KL06880

$3.95
$3.95
In stock
Volume pricing
1+ $3.95/ea
10+ $1.95/ea

The duotight 8mm to FFL Female adapter is the industry standard for connecting 8mm OD beer or gas line to threaded fittings. Designed specifically for MFL Threaded Ball Lock and MFL Pin Lock Disconnects, this fitting allows for a tool-free, clamp-free connection that is 100% airtight.

Applications & Compatibility

  • MFL Disconnects: Screw directly onto Grey (Gas) or Black (Liquid) MFL Ball Lock or Pin Lock disconnects.
  • Regulators: Fits MK4 Regulators and other homebrew CO2 regulators with MFL outputs.
  • Threaded Fittings: Compatible with any 1/4" MFL male thread.

This fitting is not required for the MK5 Regulator.

8mm Tubing Compatibility

This 8mm duotight fitting is optimised for use with EVABarrier Dual Barrier Line. It is compatible with:

The duotight Generation 2 Difference

Why settle for standard push-in fittings? duotight Generation 2 represents a massive leap in engineering over traditional acetal fittings.

Dual-Material Double O-Ring Design

The secret to our superior seal is a two-stage system using two different high-quality materials:

  1. EPDM O-Ring: Provides exceptional chemical and gas resistance.
  2. Silicone O-Ring: Maintains its shape and elasticity in sub-zero temperatures.

High-Performance Materials (POK)

Instead of standard Acetal, Generation 2 fittings are made from Polyketone (POK).

  • Higher Chemical Resistance: Withstands harsh brewery cleaners.
  • UV Protection: Won't become brittle over time.
  • Extreme Durability: Rated for over 300psi @ 25°C.

User-Friendly Features

  • Color-Coded Collets: Black denotes 8mm (5/16").
  • Depth Indicators: Includes >| |< indicators so you know the hose is fully seated.
  • No Clamps Necessary: Simply push to seal; push the collet to release.

We recommend using a Tube Cutter to ensure a perfectly straight, burr-free cut. An angled cut is the #1 cause of leaks in push-fit systems.
Product Downloads
Guide to installing FFL duotight fittings
Generation 2 duotight Design Revision

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Overall rating: 4.917808 / 5 from 73 reviews.

AI Generated Review Summary

duotight fittings are highly praised for their easy fit, leak-proof connection, and superior quality. They are designed for MFL/FFL flare and are compatible with various hosing lines, ensuring a secure seal without the need for clamps.

Summary topics

  • Ease of Fit: 13%
  • Connection Reliability: 13%
  • Leak Prevention: 15%
  • Product Quality: 18%

Review topics: ["fit","quality","leaks","works","connection","set","gas","use"].

Review highlights

  • "Awesome quality joiners, highly recommended for ease of use." — Mark B.
  • "Otherwise, no leaks and dead easy set-up!" — Jacques C.
  • "Good quality and good price." — Matt P.

Reviews

Essential

"Got to use them for the premium disconnects"

— Blake C. (5/5)

duotight 8mm

"Great product and service."

— Wayne D. (5/5)

amazing design

"John Guest is a genius for inventing push-in fittings"

— Rubine A. (5/5)

Good quality

"A no brainer"

— Nikolay V. (5/5)

Required with the MFL disconnect

"But worth the extra part to get it working"

— David G. (5/5)

Super

"Better than barbs. Love em."

— Dion (5/5)

Great product

"Great product, they make a kegerator system really easy to work on and maintain"

— Kaleb (5/5)

Duo tight

"Very handy"

— Scott H. (5/5)

Duo tight items a great,

"Duo tight items a great, good connection easy to use, love it"

— Andrew F. (5/5)

Good product

"Good product"

— John S. (5/5)

Q&A