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The Matco-Norca AVA-125 is a 1/8 inches angle steam air valve designed for use in residential and light commercial steam heating systems. This male (MIP) threaded valve installs directly into a steam radiator to automatically vent trapped air during system startup and close when steam reaches the valve. Proper air venting is critical in one-pipe steam systems because trapped air prevents steam from filling the radiator, resulting in cold spots and inefficient heating. The AVA-125 solves this problem by releasing air quickly and sealing tightly once steam arrives. HVAC technicians and plumbers rely on radiator air vents like this one to keep steam heat systems balanced and operating at full efficiency. The angle body pattern allows for easy installation in tight spaces along the side of a radiator where a straight valve may not fit. All brass construction means this valve holds up well to the heat, moisture, and pressure cycles common in steam heating environments. The full valve assembly includes a cap, body, needle, ball, spring, support, and seat, giving you a complete unit ready for installation. At 1/8 inches male iron pipe thread, this valve fits the standard tapping found on most cast iron steam radiators. Whether you are servicing an existing steam system or replacing a faulty vent that is leaking steam or failing to open, the Matco-Norca AVA-125 is a direct, reliable replacement. It is a standard part stocked by plumbing and HVAC supply professionals for boiler room and steam system repair work.
The Matco-Norca AVA-125 is a complete brass angle steam air valve built for radiator vent service in one-pipe steam heating systems. Its male thread and angle pattern make it a direct fit for standard cast iron radiators.
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