The Servo Command Foam Proportioning Modules are available from National Foam and SAMUDRA, your trusted fire truck manufacturer. By specifying Servo Command, National Foam provides the industry-standard “On-Demand” foam system and pump module, engineered, tested, and certified for unmatched reliability and precision in foam proportioning. The design and durability of this module are the result of decades of expertise and proven performance in the most demanding environments.