Merit Brass K417H-04 Hex Plug 1/4 in 304 Ss Mnpt 150 Psi

Product Description

The MERIT BRASS K417H-04 is a 1/4 inch hex plug pipe fitting machined from 304 stainless steel for reliable dead-end sealing in threaded piping systems. The male NPT (MNPT) thread pattern allows direct installation into female-threaded ports, manifolds, and fittings without adapters. At 3/4 inch in length and rated to 150 psi, it is suited for low- to medium-pressure service lines. Plumbers, pipefitters, and mechanical contractors use this plug to cap unused outlets, test ports, and branch connections during system commissioning or repair.

This hex plug is appropriate for residential and light commercial plumbing, HVAC hydronic systems, compressed air distribution, and general industrial piping where a corrosion-resistant, stainless steel closure fitting is required. The 304 stainless steel construction makes it a practical choice in moist or chemically active environments where carbon steel would be unsuitable. Standard hex drive geometry allows installation with a socket or open-end wrench without special tooling.

Key Features

• 304 stainless steel construction resists corrosion in wet and mildly aggressive service environments
• 1/4 inch MNPT threaded connection for direct fitment into standard female NPT ports
• 150 psi pressure rating suitable for low- to medium-pressure piping applications
• 3/4 inch body length provides adequate thread engagement for a leak-free seal
• Hex drive profile accepts standard socket or open-end wrenches for controlled installation torque
• ISO-compliant standards ensure dimensional consistency with other listed fittings

Compatibility

Designed as an OEM-style threaded pipe plug for use in any 1/4 inch female NPT port rated at or above 150 psi on systems where 304 stainless steel material is acceptable.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter in accordance with applicable IPC and ASME B1.20.1 thread standards. Depressurize and drain the affected line section before removing or installing any pipe plug. Apply thread sealant tape or anaerobic thread compound to the MNPT threads before installation. Do not overtighten; use a wrench on the hex drive only — do not use pipe wrenches on the fitting body.