Klein Tools 3/4x5/8rc Copper Coupling Reducer

Product Description

The KLEIN TOOLS 3/4x5/8rc is a copper coupling reducer designed to connect two different-diameter copper lines in a single sweat or press joint. It transitions from a 3/4 inch OD coupling end to a 5/8 inch OD coupling end, allowing plumbers and HVAC technicians to reduce line size without additional adapters. Copper construction ensures reliable heat transfer during soldering and long-term corrosion resistance in both refrigerant and water service applications. This fitting is a standard stock item sold individually and is sized for use in residential and light commercial installations.

This coupling reducer is suited for refrigeration line sets, hydronic systems, domestic water distribution, and other copper tube assemblies where a reduction from 3/4 inch OD to 5/8 inch OD is required. It is commonly installed during new construction, system retrofits, or line-set modifications where two different tube sizes must be joined inline. Licensed plumbers and HVAC technicians are the typical installers for this type of fitting in both commercial and residential settings.

Key Features

• Reduces from 3/4 inch OD coupling to 5/8 inch OD coupling in a single fitting
• Copper construction provides corrosion resistance and compatibility with sweat (solder) joining methods
• Inline reducer eliminates the need for multiple fittings or adapters at the transition point
• Sold individually, allowing single-unit procurement for service and repair jobs

Compatibility

Designed as an OEM-style replacement or new-installation fitting for copper tube systems requiring a reduction from 3/4 inch OD to 5/8 inch OD at a coupling joint.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician following applicable IPC or IMC code requirements. Shut off and depressurize the system and ensure the line is fully dry before soldering. Use proper flux and a compatible solder alloy rated for the intended service, whether potable water, refrigerant, or hydronic fluid. Do not overheat the fitting during soldering, as excessive heat can compromise joint integrity.

Technical Specifications

• Connection Size 1: 3/4 inch OD
• Connection Size 2: 5/8 inch OD
• Fitting Type: Coupling Reducer
• Material: Copper
• Unit of Measure: Each
• Manufacturer Part Number (Alt): HL15-165-0093

Standard Information

• Brand: KLEIN TOOLS
• Manufacturer Part Number: 3/4x5/8rc