The SFS Recirc to Drum Drop Tube Assembly is a complete A- and B-side recirculation system engineered to ensure smooth, moisture-free chemical flow during spray foam proportioner operation. Built from durable stainless steel and precision-grade fittings, this assembly allows you to recirculate to the top, middle, or bottom of your drum — giving you precise control over flow, turbulence, and pressure balance.

Complete A & B-Side Assembly

This kit includes both sides of the recirculation system with precision-built components for long-term durability and reliable performance:

• A-Side Drop Tube Assembly – SKU: 310045
  Includes an integrated stainless adapter port for attaching a desiccant dryer cartridge (SKU 236449, sold separately). This dryer provides critical moisture control on the A-side because isocyanate reacts negatively with moisture and must remain dry to prevent curing issues. Built with stainless steel tubing, flare connectors, PVC reducer, flexible coupling, and liquid-tight connectors for a sealed, moisture-controlled recirc path.
• B-Side Drop Tube Assembly – SKU: 310078
  Features a brass 1/2″ check valve, stainless 90-degree elbow, stainless nipple, flare fittings, and liquid-tight connectors. Provides safe, consistent backflow protection and stable recirculation under pressure.

Key Benefits

• ✅ Recirc to Drum Function: Adjustable stainless drop tube allows top, middle, or bottom return position.
• ✅ Dual-Side System: Includes both A-side (310045) and B-side (310078) complete assemblies.
• ✅ Desiccant Dryer Ready: A-side includes port for moisture-control cartridge 236449.
• ✅ High-Quality Components: Includes stainless steel tubing, 37° flare connectors, PVC reducers, flexible couplers, and liquid-tight connectors.
• ✅ Check Valve on B-Side: Keeps recirc flow stable and prevents backflow contamination.
• ✅ Easy Integration: Works with all SFS recirc systems and standard spray foam proportioner recirculation configurations.

Technical Overview

• 1/2″ x .049″ stainless seamless tube for clean chemical return
• GTX-S Triple-Lok 37° flare connectors ensure secure sealing
• T304 stainless steel elbows and nipples for durability
• PVC reducer and flexible coupling for drum positioning
• Liquid-tight connectors for sealed fluid management
• B-side brass check valve for flow protection

Applications

• ✔️ Spray foam proportioner recirculation loops
• ✔️ Foam & Polyurea or high-pressure coating systems
• ✔️ Equipment testing, flushing, or purge return lines

Manufactured by Spray Foam Systems (SFS), this complete Recirc to Drum Drop Tube Assembly provides industry-leading durability and precision. Each component is tested for chemical compatibility, pressure stability, and long-term reliability in demanding jobsite conditions.

FAQ Section

What does this assembly do?
It allows you to safely and efficiently return chemicals from your proportioner back into your drum. The adjustable drop tube lets you choose your recirc height for minimal turbulence and foaming.

Does this kit include the desiccant dryer cartridge?
No. The A-side includes an adapter port for adding a desiccant dryer cartridge, but the cartridge itself is sold separately 236449.

Can I adjust the return height in the drum?
Yes, the stainless drop tube can be set to recirculate at the top, middle, or bottom of your drum depending on your setup.

Is this compatible with other brands?
Yes. While designed for SFS recirc setups, it can integrate with Chemical Drums that have the 3/4” Bung Hole on Lid .