Holyoke Fittings 41 Fpl-6 Long Forged Flare Nut 3/8 in

Product Description

The HOLYOKE FITTINGS 41 fpl-6 is a long forged flare nut sized for 3/8-inch OD tubing, used to create secure, leak-resistant flare connections in refrigeration, HVAC, and plumbing systems. Forged construction delivers greater strength and pressure resistance than cast alternatives, making this nut a reliable choice for field connections that must hold up under vibration and thermal cycling. HVAC technicians and plumbers reach for this fitting when terminating or extending flare-type lines in both new construction and service work.

This flare nut is suited for residential and light commercial applications where 3/8-inch OD copper or compatible tubing is used. Common installation scenarios include refrigerant line sets, fuel gas connections, and water supply lines that require a flared mechanical joint. The long-body design provides additional thread engagement, which helps maintain a stable connection at joint points that may experience movement or vibration over time.

Key Features

• Forged construction for superior strength and pressure resistance compared to cast fittings
• Long-body design provides increased thread engagement for a more stable flare joint
• Sized for 3/8-inch OD tubing, a common dimension in HVAC and refrigeration line sets
• Compatible with standard SAE 45-degree flare connections typical in trade applications

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems using 3/8-inch OD flare-type connections in HVAC, refrigeration, and plumbing applications.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber following applicable local codes and manufacturer guidelines. Always de-pressurize and isolate the line before removing or installing any flare fitting. Use a calibrated flaring tool to prepare the tubing end before seating the nut, and tighten to fitting specifications using a properly sized flare wrench to avoid over-torquing the soft tubing. Inspect the flare seat for deformation or debris before final assembly.

WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.