Pressure & Vacuum Vents

Littlejohn Inc offers a robust lineup of pressure/vacuum vents, meticulously engineered for chemical tank trailer applications. These vital components act as safety valves, maintaining equilibrium by allowing the tank to 'breathe'—releasing excess pressure during thermal expansion and admitting air during vacuum conditions. Designed specifically for DOT 407/412 trailers, our vents prevent tank deformation, chemical release, and ensure compliance with pressure regulations.

Our inventory includes Betts chemical vents made from corrosion-resistant stainless steel or lightweight aluminum, featuring combo vents, swivel-threaded options, and ANSI flanges. These vents often include weighted rollover blocks that enhance pressure handling without shutting the vent, as well as PTFE-sealed vacuum sections for superior leak protection—all delivering dependable service even under aggressive chemical exposure.

At Littlejohn Inc, we understand that tanker safety and regulatory compliance are non-negotiable. That’s why we offer fast shipping from multiple warehouse locations and expert customer support to help you choose the proper pressure/vacuum vent for your trailer. Count on us for reliable components that protect your cargo, your equipment, and your fleet’s operational integrity.