Teflon Tube Seating Tool

The Teflon Tube Seating Tool (AEROQUIP FBM3646) is a precision installation instrument engineered for AN hose systems, particularly 3 AN through 12 AN smooth bore PTFE configurations. This tool exists to solve a critical problem: improper tube seating during hose assembly creates stress concentrations, kinks, and premature seal failure—issues that compromise hydraulic integrity and can lead to costly leaks in high-pressure applications. Whether you're building a race car's fuel delivery system, installing hydraulic lines on heavy machinery, or servicing brake systems, proper tube seating is non-negotiable for safety and longevity.

Constructed from steel and designed specifically for smooth-bore PTFE (polytetrafluoroethylene) hoses, this seating tool ensures that tube ends are inserted and seated flush within AN fittings without damage or misalignment. The tool's compact dimensions (4.75 × 0.75 × 7.2 inches) and lightweight design (0.27 lbs) make it portable and easy to control during the critical seating moment. PTFE tube seating requires a deliberate, controlled insertion process—this tool guides the tube straight through the compression fitting without binding or cocking, preventing the flare damage that can render expensive hoses unusable. The natural steel finish is durable and corrosion-resistant for shop and field use.

Mechanics, fabricators, and hydraulic specialists working with 3 AN to 12 AN systems will find this tool indispensable for consistent, professional-grade hose assembly. It's especially valuable in applications where hoses must withstand vibration, thermal cycling, or sustained pressure—racing fuel systems, turbo plumbing, transmission cooler lines, and industrial hydraulics all benefit from perfect tube seating. Proper installation using this tool reduces rework, extends hose life, and eliminates the frustration of discovering leaks after system pressurization. Keep one in your toolkit for every smooth-bore PTFE project.