Huma Quickfill adapter for FX pressure bottle

Huma-Air Quickfill Adapter for FX Pressure Bottle

Zero Air Loss. Easy Fills. Built for FX Bottles.

The Huma-Air Quickfill Adapter for FX Pressure Bottles is a precision-engineered stainless steel filling solution that lets you top up your spare FX air bottles quickly, easily, and without wasting a single drop of air. Featuring a male Foster connection and Huma-Air's special no-loss design, this adapter screws on and off your FX bottle without releasing any air — keeping maximum pressure in your spare bottle every time.

Overview

Filling your spare FX bottle is now as simple as filling your rifle. Just screw the adapter into the bottle, connect your fill hose, fill slowly to maximum allowed pressure, close your scuba tank, depressurize the fillset and hose, and you're done. The adapter unscrews cleanly without any air loss — every time. The integrated M4/M6 threaded hole adds further versatility, accepting a headless allen bolt that can open the bottle valve for controlled depressurization or act as a flow restrictor for slow, safe fills. Compatible with all FX cylinders including the 300cc, 480cc, 580cc, and Dreamline compact air cylinder.

Key Features

• Stainless steel quickfill adapter with male Foster connection
• Special no-loss design — screws on and off without releasing any air
• Integrated M4/M6 threaded hole for headless allen bolt use
• Allen bolt opens bottle valve for controlled depressurization
• Allen bolt also functions as flow restrictor for slow, controlled fills
• Compatible with all FX cylinders — 300cc, 480cc, 580cc, and Dreamline compact
• Includes replacement 5.5x1.5 FKM O-ring for improved valve seat retention
  
  

Performance Advantage

• Zero air loss design keeps maximum pressure in your spare bottle between uses
• Same filling process as your FX rifle — no new technique or equipment required
• Flow restrictor capability ensures slow, safe fills that protect your bottle and valve
• Controlled depressurization option via allen bolt for safe, convenient bottle pressure release
• Stainless steel construction ensures long-term durability and corrosion resistance
  
  

Included O-Ring Note

The FX valve construction uses a 4.5x1.5 O-ring that can occasionally be dislodged by the blast of air during filling, causing the valve seat to not close properly. Huma-Air includes an upgraded 5.5x1.5 FKM O-ring with every adapter — replacing the factory O-ring with this upgraded version prevents valve seat dislocation and ensures proper sealing during use. Replacement can be done before first use as a preventative measure or immediately if the issue occurs.

Compatibility

• FX 300cc cylinder
• FX 480cc cylinder
• FX 580cc cylinder
• FX Dreamline compact air cylinder
  
  

Specifications

⚠️ Bottle not included. Always fill to the maximum allowed pressure of your specific FX rifle — not the bottle's maximum capability.