Merit Brass K611H-12 Half Coupling 3/4 in 316 Ss Fnpt

Product Description

The MERIT BRASS K611H-12 is a 3/4-inch pipe half coupling manufactured from 316 stainless steel for use in threaded piping systems. This fitting features a female National Pipe Taper (FNPT) end connection and carries a 150 psi pressure rating. It is designed to join a pipe to a vessel, tank wall, or flat surface where only one threaded end is required. Licensed plumbers and pipefitters install this type of fitting in industrial, commercial, and marine plumbing applications where corrosion resistance is a priority. The 316 stainless steel alloy provides enhanced resistance to chlorides and acidic media compared to 304-grade material.

This half coupling suits residential and commercial piping systems that require a durable, corrosion-resistant threaded connection at a pipe terminus or equipment tap. It is well suited for use in chemical processing, marine, food service, and general-purpose plumbing where stainless steel is specified. The FNPT threading allows direct connection to standard NPT male-threaded pipe or fittings. At 0.15 pounds, this compact fitting is easy to handle and install in tight spaces. The ISO-compliant construction meets internationally recognized dimensional standards for interchangeable installation.

Key Features

• 316 stainless steel construction resists corrosion in chloride-rich and acidic environments
• FNPT end connection threads directly onto standard male NPT pipe
• 150 psi pressure rating suitable for low-to-medium pressure piping systems
• ISO-compliant dimensions for consistent, interchangeable fit
• 3/4-inch fitting size covers a common pipe size used across plumbing and process systems
• Compact and lightweight at 0.15 pounds for easy single-hand installation

Compatibility

Designed as an OEM-style replacement or new-installation half coupling for 3/4-inch NPT threaded piping systems requiring a 316 stainless steel FNPT fitting.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter in accordance with applicable IPC or ASME B31 piping codes. Shut off and depressurize the piping system completely before removing or installing any threaded fitting. Apply a compatible thread sealant or PTFE tape to male NPT threads before engagement; do not apply sealant to the female threads of this coupling. Hand-tighten first, then use appropriate pipe wrenches to achieve a leak-free connection without over-torquing the stainless steel threads.