Eff 103366-lf Brass Pex X Female Sweat Adapter 3/4 Inches

Product Description

The EFF 103366-lf is a 3/4 inch brass adapter fitting designed to connect PEX tubing to a female sweat copper fitting. This lead-free brass adapter is a reliable transition fitting used in residential and commercial plumbing systems where PEX and copper piping meet. Plumbers and pipe fitters rely on this type of adapter when retrofitting older copper systems with modern PEX supply lines, or when connecting new PEX runs to existing copper distribution systems.

The fitting features a 3/4 inch PEX connection on one end and a 3/4 inch female sweat connection on the other. The female sweat end accepts standard 3/4 inch copper pipe, which is soldered in place using standard plumbing torch and solder techniques. The PEX end is compatible with PEX crimp rings, PEX clamp rings, or expansion-style fittings, depending on the installation method used on the job site. This makes the 103366-lf a versatile fitting that works with multiple PEX installation tools and systems.

Brass is the preferred material for transition fittings in plumbing applications. It resists corrosion, handles high water pressure, and performs reliably across a wide range of water temperatures. The lead-free designation makes this fitting compliant with modern drinking water standards, suitable for potable water systems in homes, commercial buildings, and light industrial facilities. HVAC and plumbing professionals working on hydronic heating systems, domestic hot and cold water distribution, and water service connections will find this adapter a dependable solution for mixed-material pipe systems.

• 3/4 inch PEX to 3/4 inch female sweat transition adapter for mixed-material plumbing connections
• Lead-free brass construction meets potable water compliance requirements
• Compatible with PEX crimp, clamp, and expansion installation methods

Product Highlights

The EFF 103366-lf provides a durable, lead-free brass connection point between PEX tubing and female sweat copper fittings, making it a dependable choice for potable water and hydronic plumbing applications where PEX and copper systems must be joined.

Product Information

Standard Information

• Brand: EFF
• Manufacturer Part Number: 103366-lf

Technical Specifications

• Fitting Type: Adapter
• Material Construction: Brass
• Connection Type 1: PEX
• Connection Size 1: 3/4 inches
• Connection Type 2: Female Sweat
• Connection Size 2: 3/4 inches