Pre-Assembled & Cut-to-Length Trunk Line for Long Draw Systems
Trunk line — also called python — is the insulated bundle that carries beer from your walk-in cooler to your draft tower. Every long draw system needs it. Ours is built right: barrier beer lines, glycol supply and return, and a durable insulated jacket, all bundled and ready to pull.
What's Inside a Trunk Bundle
- Barrier beer lines — Barriermaster™ Flavourlock multi-layer barrier tubing; prevents CO2 loss and O2 pickup over long runs
- Glycol supply & return lines — keeps beer at serving temp from cooler to faucet
- Insulated jacket — foam-filled PVC outer sleeve minimizes temperature gain in warm spaces
Ordering
- Priced and cut by the foot — order the exact run length you need, no waste
- Choose your bundle configuration — the "bundle" is the trunk line itself: how many beer lines and glycol lines are wrapped together in one insulated jacket, sized to your tap count
- Custom configurations — need more beer lines or a larger glycol line? Contact us.
Sizing Guide
- Most commercial long draw systems use 3/16" barrier beer line inside the trunk
- Glycol line sizing depends on your power pack — match the OD spec from your chiller manufacturer
- Trunk diameter (number of beer lines) is determined by your tap count
Not sure what you need? Our team specs long draw systems daily — reach out before you order.
Trunk Line FAQ
What beer line ID size should I use — 1/4", 5/16", or 3/8"?
Smaller ID (1/4") adds more resistance and is common on shorter runs or when you need to slow down an over-carbonated beer; 3/8" flows faster and suits longer runs where you want less restriction. 5/16" is the middle-ground default for most standard-length long draw systems. Your actual balance depends on run length, rise, and regulator pressure — contact us if you want it specced exactly.
How many beer lines and glycol lines do I need in my trunk?
Beer line count matches your tap count — one beer line per faucet. Glycol line count depends on your power pack's circuit design, not your tap count directly; a single-pump power pack typically needs one supply and one return line, while multi-zone setups need more. Match glycol lines to your chiller's spec sheet before ordering.
Why does trunk line need an insulated jacket if it already has glycol lines?
The glycol lines keep the beer cold, but the insulated jacket keeps outside heat from working against them — without it, a run through a warm ceiling or wall cavity makes the glycol system work harder and lose efficiency over the length of the run. The jacket is what makes the long-draw distance actually practical.
Building a Full Long Draw System?
Trunk line is one piece of a complete long-draw draft beer system. See our Glycol Chillers collection for the power pack that keeps it cold, and Draft Beer Towers for the dispense point at the end of the run.
