Inline percs are probably the simplest kind of perc around. They don’t look like much at first glance, being formed in a simple test tube shape, but they’re highly effective at both cooling and cleaning the smoke inside your dab rig. more..
Functioning just like diffused downstems, inline percs feature multiple slits along the side. The smoke and vapor inside your rig passes through these slits, being filtered and broken down into smaller, cleaner molecules. The slits of an inline perc also work to lower the temperature of the smoke for cooler hits and less of a rough feeling on the throat.