McDonnell & Miller 306700 Kit

Optimize your industrial flow control systems with the McDonnell & Miller 306700, a professional-grade FS7-28 bronze paddle kit designed for high-performance liquid flow switches. This kit is the direct OEM replacement for FS7-4 Series units, including 1-inch and 6-inch bronze paddles to accommodate various pipe diameters and flow velocities. Whether you are servicing FS7-4, FS7-4E, or FS7-4W models, these precision-engineered paddles ensure accurate flow switch sensitivity and reliable SPDT snap switch activation. As a veteran-preferred HVAC replacement part, the 306700 kit allows for field trimming to meet specific setpoint requirements in heating, hydronic, and process cooling applications. Proper installation maintains the magnetic switching mechanism integrity, preventing nuisance shutdowns in commercial boiler systems. Built for durability, these bronze components withstand maximum pressures up to 300 psi and fluid temperatures reaching 300°F, providing the robust sensing surface required for consistent liquid flow switch operation in demanding environments.

• Directly compatible with FS7-4 Series, FS7-4E, and FS7-4W liquid flow switches.
• Includes both 1-inch and 6-inch bronze paddles with mounting screws and washers for immediate field replacement.
• Paddles are trimmable to facilitate custom flow rate adjustments and precise setpoint calibration.
• Engineered for industrial environments with a maximum operating pressure of 300 psi.
• Maintains the reliability of the magnetic switching mechanism by eliminating the need for bellows.

Which flow switch models are compatible with the FS7-28 kit?
The McDonnell & Miller 306700 is specifically designed for the FS7-4, FS7-4E, and FS7-4W series. It is the standard bronze paddle assembly for these industrial-duty switches.

Can I trim these paddles for smaller pipe sizes?
Yes. Experienced technicians can trim the 6-inch paddle using the provided notches to match the specific pipe diameter and required flow activation sensitivity of the system.

What is the difference between the 306700 and 306800 kits?
The 306700 (FS7-28) features bronze paddles for standard applications, while the 306800 (FS7-28S) uses stainless steel paddles for corrosive environments or specialized "S" model switches.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.