Push Fit Fittings — John Guest & Duotight

Push fit fittings are the standard way to connect beer and gas lines in a home keg dispense system, and both John Guest and Duotight have earned their place as the go-to options for homebrew and commercial setups alike. The push-to-connect design makes installation straightforward – no tools, clamps or sealing agents needed – and fittings are fully demountable when you need to clean, reconfigure or extend your setup down the line.

At The Malt Miller, we stock both brands across the line sizes most commonly used in homebrew dispense: 3/8″, 5/16″ and 3/16″. Between John Guest and Duotight you’ll find pretty much every connection type a home keg system needs: straight joiners, adapters, elbows, tee pieces, splitters and plugs – with clear sizing and compatibility details on each product listing to help you get the right fitting first time.

If you’re building out a full draft system, the rest of what you need is across our beer dispense equipment range and keg fittings and spares.

  • 3/8" Push Fit Fittings - Threaded

    3/8" Push Fit Fittings - Threaded

  • 5/16" ( 8mm ) Push Fit Fittings - Threaded

    5/16" ( 8mm ) Push Fit Fittings - Threaded

  • Adapters - Elbows - Barbs

    Adapters - Elbows - Barbs

  • Push Fit Fittings - Accessories

    Push Fit Fittings - Accessories

  • Tube Cutter 2 In 1 Cuts Beer/ Gas line cleanly

    Tube Cutter 2 In 1 Cuts Beer/ Gas line cleanly

    £4.50

    For clean, straight cuts this 2 in 1 cutter is an integral tool
  • JOHN GUEST 1/4 FFL Female to 3/8" Line Adapter PI4512F4S

    JOHN GUEST 1/4 FFL Female to 3/8″ Line Adapter PI4512F4S

    £3.00

    Screws onto black and grey disconnects and is a push fit for the 3/8 beer/gas line.
  • John Guest 5/16 push fit to 1/4 FFL Adapter PM4508F4S

    John Guest 5/16 push fit to 1/4 FFL Adapter PM4508F4S

    £3.00

    Screws onto the the keg grey and black disconnects and is a push fit for the 5/16 beer/gas line.
  • 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 (suits Keg Couplers and Tap Shanks)

    £2.75

    This straight joiner connects 5/8" threaded fittings to 5/16"line as required for tap shanks

     Awaiting Stock
  • Duotight - 9.5mm (3/8”) Female x 1/2” BSP Female Thread

    Duotight – 9.5mm (3/8”) Female x 1/2” BSP Female Thread

    £2.75

    This straight joiner connects 1/2" BSP threaded fittings to 3/8"line.
  • Duotight - 9.5mm (3/8”) Female x 5/8” Female Thread

    Duotight – 9.5mm (3/8”) Female x 5/8” Female Thread

    £2.75

    This straight joiner connects 5/8" threaded fittings to 3/8"line as required for tap shanks
  • Duotight - 6.35mm (¼') Female x 8mm (5/16') Female Reducer

    Duotight – 6.35mm (¼’) Female x 8mm (5/16′) Female Reducer

    £2.50

    This straight joiner connects 6.35mm ( 1/4") duotight fittings to 8mm beer/gas line.
  • Duotight - 9.5mm (3/8”) Female x 9.5mm (3/8”) Female Joiner

    Duotight – 9.5mm (3/8”) Female x 9.5mm (3/8”) Female Joiner

    £2.50

    This straight joiner connects 9.5mm ( 3/8 ) beer and gas line. Handy if you need to extend an existing line.
  • John Guest 3/8 to 3/8 Connector

    John Guest 3/8 to 3/8 Connector

    £3.00

    This adapter will connect 2 pieces of 3/8 beer/gas line
  • Duotight - 9.5mm (3/8”) Female x 9.5mm (3/8”) Female Elbow

    Duotight – 9.5mm (3/8”) Female x 9.5mm (3/8”) Female Elbow

    £2.50

    This straight joiner connects 5/8" threaded fittings to 3/8"line as required for tap shanks
  • duotight - 9.5mm (3/8”) Female x 9.5mm (3/8”) Female Tee Piece

    Duotight – 9.5mm (3/8”) Female x 9.5mm (3/8”) Female Tee Piece

    £2.70

    This tee piece connects 3/8" threaded fittings to 3/8"line as required for beer and gas line joining and splitting
  • Duotight – 8mm (5/16”) Female x 8mm (5/16”) Female Equal Tee

    Duotight – 8mm (5/16”) Female x 8mm (5/16”) Female Equal Tee

    £2.50

    This tee piece connects 5/16"line as required for beer and gas line joining and splitting
  • John Guest 3/8" Single Check Valve

    John Guest 3/8″ Single Check Valve

    £14.85

    John Guest 3/8" Single Check Valve.
  • duotight - 9.5mm (3/8”) Female x 9.5mm (3/8”) Female One Way Check Valve (Gas)

    duotight – 9.5mm (3/8”) Female x 9.5mm (3/8”) Female One Way Check Valve (Gas)

    £5.50

    This elbow is suitable for 3/8" Valpar Beer & Gas lines
  • Duotight - 8mm (5/16”) Female x 8mm (5/16”) Female One Way Check Valve (Gas)

    Duotight – 8mm (5/16”) Female x 8mm (5/16”) Female One Way Check Valve (Gas)

    £5.00

    This elbow is suitable for 3/8" Valpar Beer & Gas lines
  • Duotight – 8mm (5/16”) Female x 8mm (5/16”) Female Push In Elbow

    Duotight – 8mm (5/16”) Female x 8mm (5/16”) Female Push In Elbow

    £2.50

    This elbow is suitable for 5/16" Valpar Beer & Gas lines
  • Duotight – 8mm (5/16”) Female x 8mm (5/16”) Female Push In Joiner

    Duotight – 8mm (5/16”) Female x 8mm (5/16”) Female Push In Joiner

    £2.50

    This straight joiner is suitable for 3/8" Valpar Beer & Gas lines
  • 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)

    £2.50

    This straight joiner is suitable for 5/16 Valpar Beer & Gas lines
  • Beer Flow Restrictor 3/8 to 3/16 – Adjustable Beer Line Control for Smooth, Foam-Free Pours

    Beer Flow Restrictor 3/8 to 3/16 – Adjustable Beer Line Control for Smooth, Foam-Free Pours

    £7.95

    3/8-3/16 Adjustable beer flow restrictor for smooth, foam-free pours. Fits easily to beer lines for perfect keg...
  • Beer Flow Restrictor 3/8 to 5/16 – Adjustable Beer Line Control for Smooth, Foam-Free Pours

    Beer Flow Restrictor 3/8 to 5/16 – Adjustable Beer Line Control for Smooth, Foam-Free Pours

    £7.95

    3/8-5/16 Adjustable beer flow restrictor for smooth, foam-free pours. Fits easily to beer lines for perfect keg...