Angle Radiator Air Valve, Adjustable, Brass, Chrome - Eastman 20378 The EZ Flow 20378 plastic radiator air valve is a compact, angle-style vent designed to automatically release trapped air from hydronic heating systems, ensuring optimal heat transfer and system efficiency. Featuring a 1/8-inch National Pipe Tapered (NPT) inlet and a male NPT (MNPT) outlet, it threads directly into radiator air vents or system manifolds to allow air to escape while preventing water leakage. Constructed from durable, corrosion-resistant plastic, it withstands prolonged exposure to hot water and steam without degradation. Designed for low-pressure applications up to 1.5 psi (with a maximum pressure rating of 10 psi), it is ideal for residential hydronic radiators, baseboard heaters, and radiant floor systems. Features - Angle design allows for easy installation in tight radiator spaces without interference - 1/8 in NPT inlet and MNPT outlet ensure compatibility with standard radiator air vent threads - Automatic air release mechanism opens under air pressure and closes when water reaches the valve - Plastic construction resists rust, corrosion, and mineral buildup in hot water systems - Maximum operating pressure: 1.5 psi ? optimized for residential hydronic systems - Maximum pressure rating: 10 psi ? provides safety margin for system surges - No manual adjustment required ? fully automatic operation for maintenance-free performance - Lightweight and easy to install with standard pipe wrench or hand tightening - Prevents air locks that reduce heating efficiency and cause noisy operation - Designed for use in closed-loop hot water systems only ? not for steam or high-pressure systems - Meets industry specifications for residential heating applications Specifications - Brand Name: EZ Flow (Eastman) - Model Name: EZ Flow 20378 - Product Type: Radiator Air Valve - Material: Plastic (Thermoplastic) - Inlet Connection Size: 0.13 in (1/8 in NPT) - Outlet Connection Size: 0.13 in (MNPT) - Inlet Connection Type: National Pipe Tapered (NPT) - Outlet Connection Type: Male NPT (MNPT) - Number of Ports: 2 - Maximum Operating Pressure: 1.5 psi - Maximum Pressure Rating: 10 psi - Design: Angle Valve - Color: White - Dimensions: 7x1x3 in (LxWxH) - Weight: 2.08 oz - Certification: Meets industry specifications for residential hydronic systems - Country of Origin: United States - UPC: 045552203786 - GTIN: 00045552203786 - Manufacturer: Eastman (EZ Flow) Product Application The EZ Flow 20378 radiator air valve is used by HVAC technicians, plumbers, and homeowners maintaining residential hydronic heating systems with cast iron or aluminum radiators and baseboard convectors. Essential for eliminating air pockets that reduce heat output, cause gurgling noises, or create cold spots, this automatic valve ensures consistent circulation and optimal system efficiency. It is installed directly into radiator air vent ports and requires no tools or adjustment ? operating silently and reliably for the life of the system. Ideal for retrofitting older radiators or upgrading systems with manual bleed valves, it delivers quiet, maintenance-free operation and the confidence that heating performance remains consistent throughout the season.