Duotight 8mm (5/16") Liquid Ball Lock Disconnect

Duotight 8mm Liquid Keg Disconnect – 5/16" Ball Lock

Duotight 8mm (5/16") Liquid Ball Lock Disconnect – Kegging Hardware

If you’re running EVA Barrier lines and you want your beer side to be a bit neater and less fiddly, this Duotight 8mm liquid ball lock disconnect does the job really well. It snaps onto the liquid post like a normal disconnect, but instead of a barb and clamp, you just push your 8mm line straight in. No heating tubing, no wrestling with hose clamps, and way less swearing when you decide you want to shorten or reroute a line later.

This one’s the black/yellow liquid disconnect, so it’s for the beer side of your ball lock keg – perfect for serving beer, cider, soda, whatever you’re running through that post.

Duotight 8mm Liquid Ball Lock Disconnect – How It Works & What to Expect

The Duotight 8mm liquid ball lock disconnect has the Duotight push-fit built right into the top, so the fitting and disconnect are one compact unit. As long as your tubing is cut clean and square, you just push it in until it bottoms out and it locks in place. The seal is surprisingly solid – once it’s in, you can yank on the line and it’s not going anywhere under normal keg pressures.

Compared to the old-school plastic disconnects, this one’s smaller and feels more refined. The internal design is set up for good flow, so you’re not choking the beer as it leaves the keg, and the overmoulded poppet means you can still pop it on and off even at higher pressures without blowing out tiny o-rings. It’s the kind of bit of gear you don’t think much aboutÉ until you go back to barbs and clamps and instantly miss it.

What You Need to Use It

Nothing fancy, just normal kegging gear:

• Ball lock keg with a liquid post (black post)
• 8mm (5/16") OD EVA Barrier or similar rigid beer line
• Tap or beer gun on the other end of your line
• CO? tank and regulator to push the beer out of the keg
• Soapy water or sanitizer spray to check for leaks after setup

Product Specifications

• Connection Type: Ball lock (liquid, black/yellow)
• Tubing Size: 8mm (5/16") OD line
• Best With: 4 mm or 5 mm ID x 8 mm OD EVA Barrier-style tubing
• Fitting Style: Integrated Duotight push-in (no extra threaded fittings needed)
• Form Factor: Very compact, ideal for tight keezers/kegerators
• Poppet: Overmoulded design for reliable sealing even at higher pressures
• Disassembly: Tool-free cap for easy cleaning and pulling apart
• Materials: Chemical-resistant engineering plastic body with stainless internals and EPDM seals
• Chemical Resistance: Handles common brewing cleaners and sanitisers (acid and caustic)
• Use: Liquid side only – pair with the grey/red version for gas

A Brewer’s Tip

When you first push the line in, give it a firm, confident shove, then tug back lightly to make sure it’s properly seated. If you ever need to move or shorten the line, push the little collar down with one hand and pull the tubing out with the other. And seriously – spend a couple of bucks on a tubing cutter; clean, square cuts are the difference between “perfectly sealed” and “slow, mysterious drip in the bottom of the fridge.”

Frequently Asked Questions

Is this for beer or gas?
This one’s for the liquid side (black/yellow). Use it on the beer post. For gas, grab the matching grey/red gas disconnect in the same size.

What tubing works best with it?
It’s designed for 8mm OD rigid-style line, like 4 mm or 5 mm ID EVA Barrier. Soft, squishy vinyl tubing doesn’t lock in as securely.

Can I take it apart to clean?
Yep. The cap is designed to unscrew by hand so you can get inside, rinse out hop debris, and put it back together without tools.