Taco 433-5 Air Scoop

The Taco 433-5 Air Scoop is a 1.5-inch cast iron air separator designed to maintain a noiseless, air-free hydronic heating or cooling system. As the direct replacement for the legacy Taco 433, this specific model features an engineered baffle that intentionally disrupts water velocity. By slowing the flow, it forces entrained air out of the solution, allowing bubbles to rise into the top collection chamber for efficient venting. This process is critical for preventing common contractor headaches like cavitation and system noise in recirculating water loops.

Built for durability in high-demand residential and light commercial applications, the Taco 433-5 supports a maximum operating pressure of 125 PSI and operating temperatures up to 300°F. The housing includes multiple connection points for maximum versatility: a 1/8-inch NPT top tapping for an automatic air vent (like a Hy-Vent) and 1/2-inch and 3/4-inch NPT tappings for integrating expansion tanks. For optimal air elimination, technicians should ensure a minimum of 18 inches of straight horizontal pipe before the inlet connection to allow bubbles to stabilize at the top of the pipe before entering the baffle area.

• One-piece cast iron construction ensures long-term structural integrity and corrosion resistance in water/glycol systems.
• Direct 433 replacement provides a seamless drop-in fit for existing 1.5-inch FNPT pipe headers without extensive re-piping.
• High-temperature compatibility rated for 300°F makes it ideal for high-mass boiler systems and solar thermal loops.
• Integrated tank tappings allow the expansion tank and air scoop to be co-located at the system's "point of no pressure change."
• Low-maintenance design utilizing internal baffles requires no moving parts or regular mechanical servicing.

Where is the best location to install the air scoop?
Install the Taco 433-5 on the main supply line leaving the boiler. This is where water is at its highest temperature and lowest pressure, which is the optimal point for air to release from the water solution.

Does this unit work with glycol-based systems?
Yes, the cast iron body is fully compatible with standard water and water/glycol mixtures commonly found in closed-loop radiant and hydronic systems.

Can I install this air scoop in a vertical pipe run?
No. Air scoops rely on gravity and buoyancy to separate bubbles. They must be installed in a horizontal orientation with the vent and tank tappings facing upward to function correctly.

This item is not eligible for free shipping.

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.