Eaton 2021-12-12S Steel Flared Tube Connector 3/4 in

Product Description

The EATON 2021-12-12S is a steel flared tube connector designed for hydraulic, pneumatic, and fluid system plumbing applications. It features a 37-degree flare seat on one end and a male NPT threaded end on the other, creating a reliable Flare x MNPT transition fitting. The 3/4 inch tube OD and 3/4 NPT thread size make it suitable for medium-bore line connections where a leak-resistant mechanical seat is required. Licensed plumbers, pipefitters, and fluid power technicians use this type of fitting when transitioning between flared tubing runs and NPT-threaded ports on valves, manifolds, or equipment housings.

This connector is well suited for residential and light commercial plumbing, refrigeration, fuel, and hydraulic line installations where 37-degree flared tubing must terminate at an NPT-threaded component. The 3/4 inch size is a common line size in HVAC refrigerant piping, fuel oil systems, and hydraulic return lines. It is sold individually and is appropriate for new installation as well as repair and retrofit work where an existing flared line needs to connect to a threaded fitting or port.

Key Features

• 37-degree flare seat provides a metal-to-metal seal without additional sealant on the flare side
• Male NPT end allows direct connection to standard NPT-threaded ports and valves
• Steel construction offers durability in high-pressure and moderate-temperature service
• 3/4 inch tube OD and 3/4 NPT thread size in a single compact connector body
• Flare x MNPT end configuration simplifies transitions between tubing runs and threaded components

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems using 3/4 inch OD flared tubing with 37-degree flare seats terminating at 3/4 NPT-threaded ports.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified fluid power technician in accordance with applicable codes. Depressurize and drain the system completely before removing or installing any fitting. Apply thread sealant or PTFE tape to the NPT male threads only — do not apply sealant to the flare seat. Ensure the mating flare nut and tube end are properly formed to the correct 37-degree angle before tightening to avoid seat damage or leaks.