We highly reccomend using EVABarrier 5mm x 8mm with duotight fittings.
1 x – A-Type Coupler with 5/8″ Male Beer and Gas threads
2 x – duotight 5/8″ duotight to 8mm push in
1 x – Non-Return Ball or Torpedo check piece (Non-Return Liquid)
1 x – Gas Duck Bill valve (Non-Return Gas)
*Please note most A-type kegs are too tall to fit in the Series 4 or Series X without a “KL00390 – Low Profile Elbow Bend” as well as an EPDM 5/8″ Washer on the couplers liquid out side (sold separately).