HPA Lines

The HPA line is the connection between your air supply and your rifle. Length, fitting type, and build quality matter more than most players realise.

An HPA line runs from the output of your regulator to the input of your rifle. It carries air at roughly 100 PSI in normal use — well within working pressure for the braided weave construction every quality airsoft line uses — but the wrong line for your build will get caught on gear, kink mid-game, or burst at the fitting. The right line disappears from your awareness and lets you focus on the rifle.

Length is the first decision. 36" is the most popular UK length — long enough for a tank mounted on a chest rig or hip with a rifle held in a standard ready position, short enough not to dangle. 42" suits taller players or those who run a tank on a back panel. Shorter lines (24") are for speedsoft builds where the tank rides on a pistol belt; longer lines (48"+) are for support-weapon roles or specific rigging needs.

Fittings come in two standards: macroline (the older standard, sometimes called 1/8" NPT) and the newer quick-disconnect (QD) fittings that let you swap between rifles or between rifle and PTX pistol without losing pressure. If you run more than one HPA platform, QD fittings on both ends save serious time on game day. Standard weave construction by Amped is the UK benchmark — Wolverine and PolarStar lines are equally trusted and ship in colour options for rig coordination.

💡 Titan Forge tip: Always run your line under your chest rig rather than over it. Snagged lines mid-game are the most common HPA failure mode and the easiest to avoid. The HPA accessories collection has clips and routing solutions for this.