UNST3400 3/4" Copper Union Straight Connector

The UNST3400 is a 3/4" copper union straight connector engineered for reliable, reusable and leak-resistant joints in air conditioning and refrigeration systems. It simplifies installation and maintenance by eliminating the need for brazing or flaring, while maintaining a professional, pressure-tight seal. Available exclusively from airconspares.com with fast UK delivery.

Key benefits

• Fast installation: connects 3/4" copper tube securely without heat or special tools.
• Serviceable design: can be disconnected for maintenance or component replacement.
• Reliable sealing: precision-machined surfaces reduce leak risk under pressure.
• Durable build: corrosion-resistant copper body for long service life.
• HVAC/R ready: suitable for UK air conditioning and refrigeration linesets.

Typical applications

• Joining or extending 3/4" suction or liquid copper lines
• On-site repairs or system modifications
• Installation of new HVAC and refrigeration equipment

Specification

• Product code: UNST3400
• Type: Union Straight (inline fitting)
• Pipe size: 3/4" (outside diameter)
• Material: Copper with precision mating surfaces
• Use: Air conditioning & refrigeration copper pipe connections

Installation guidance

• Ensure pipe ends are cut square and free from burrs.
• Clean and inspect mating surfaces before assembly.
• Hand-tighten, then torque to the recommended specification.
• Pressure-test and leak-check the joint before commissioning.

Good to know

• Match the pipe OD carefully to the fitting size.
• See other Smartlock fittings for reducers, elbows and multi-angle connectors.
• Trade and volume discounts available through AirconSpares UK.

Order UNST3400 online at airconspares.com for quality Smartlock fittings, fast UK dispatch and reliable customer support.