The SFS A Side Desiccant Transfer Pump Assembly (SKU 236618) is a moisture-control solution designed for spray foam and fluid transfer systems. Built to mount directly into a 3/4-inch drum bung hole, this assembly prevents humidity from entering the drum and protects moisture-sensitive A-side chemistry such as isocyanate.

This assembly includes a built-in check valve for controlled, one-way airflow and a desiccant cartridge port (cartridge sold separately). By removing moisture from incoming air, the desiccant helps prevent crystallization, contamination, and curing issues inside A-side chemical drums.

Moisture Control for Isocyanate Systems

Isocyanate reacts immediately with moisture, causing foaming, curing, and equipment damage. This A-side assembly functions as a sealed breath-through system that filters incoming air through a desiccant cartridge to keep A-side chemicals dry and stable.

Key Benefits

• ✔️ Built-in check valve for controlled one-way airflow
• ✔️ Desiccant port removes humidity before it enters the drum
• ✔️ Prevents moisture contamination in isocyanate systems
• ✔️ Installs directly into a 3/4” drum bung
• ✔️ Compatible with any transfer pump
• ✔️ Durable stainless, brass, PVC, and camlock components

Technical Features

• 1/2″ Y-strainer for debris filtration
• Brass 1/2″ x 1/2″ check valve for airflow protection
• PVC reducer bushing and flexible coupling
• 1/4 NPT x #6 JIC connector (6-FTX-S)
• 45° pipe swivel elbow for routing
• Type D & Type F aluminum camlock fittings
• PTFE Teflon tape included for sealing

Applications

• Spray foam A-side isocyanate systems
• Transfer pump moisture protection
• Sealed drum ventilation with desiccant air filtration
• Preventing drum contamination in humid environments

FAQs

Does this work with all drums?
Yes. It fits any chemical drum with a 3/4″ bung hole on the lid.

Does this include the desiccant cartridge?
No. The desiccant cartridge (SKU 157386) is sold separately.

Why is moisture control needed for A-side chemicals?
A-side isocyanate reacts with moisture, causing curing, crystallization, and contamination. The desiccant removes humidity before air enters the drum.

Does this recirculate to the drum or the pump?
This A-side assembly manages incoming air to the drum. For full recirc-to-pump function, pair with the B-side assembly (SKU 236615).

Do I need the B-side assembly with this?
The A-side manages moisture control. Pairing with the B-side assembly helps regulate drum pressure and prevents vacuum lock.