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The Holyoke Fittings FM12X38 is a brass SAE flare tube to male pipe straight adapter designed to connect a 1/2 inch OD flare tube to a 3/8 inch male iron pipe (MIP) thread in a single, straight-line connection. This type of adapter is a foundational component in refrigeration, HVAC, and plumbing systems where copper or aluminum tubing must transition to a threaded pipe connection. The SAE flare fitting style creates a leak-resistant mechanical seal by compressing a flared tube end against the fitting seat, which makes it a preferred choice for technicians working with refrigerant lines, gas lines, and other fluid-carrying systems where pressure integrity is critical. Manufactured in the USA from solid brass, the FM12X38 resists corrosion and holds up well under the temperature and pressure cycles common in HVAC and refrigeration applications. Brass construction also makes it compatible with a wide range of working fluids, including refrigerants, natural gas, propane, and water. HVAC technicians, plumbers, and pipefitters rely on straight adapters like this one when routing tubing to threaded pipe fittings in tight equipment spaces or during system repairs and new installations. The straight adapter profile keeps the connection compact and inline, reducing the need for additional offset fittings. At 1.53 inches in length and 0.75 inches in width, the FM12X38 fits into confined areas without adding bulk. With a weight of 0.12 pounds, it is lightweight and easy to handle during installation. This fitting is sold individually and ships ready for immediate use. It does not require welding or soldering, which speeds up installation time on the job site. The SAE flare design is an industry-standard connection method recognized by HVAC and refrigeration professionals worldwide.
The Holyoke Fittings FM12X38 delivers a dependable, code-recognized SAE flare connection between 1/2 inch OD tubing and 3/8 inch MIP pipe threads. Its solid brass, USA-made construction makes it a trusted choice for HVAC technicians and plumbers working on refrigerant, gas, and fluid systems.
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