Fixed Elbow, 1/4″ Thread x 3/8″ Push Fit (John Guest)

Description

The Fixed Elbow, 1/4" Thread x 3/8" Push Fit (John Guest) is a high-quality 90° push-to-connect fitting designed to connect 3/8" OD tubing to a 1/4" threaded port. Commonly used in reverse osmosis systems, water filtration setups, and beverage equipment, this fitting allows for quick, secure, and leak-free installation without tools.

Built with trusted John Guest push-fit technology, it’s ideal for applications where higher flow rates (3/8" tubing) are required while still connecting to standard 1/4" threaded ports.

Key Features

• Push-Fit Technology: Tool-free installation—simply push tubing into place
• 90° Elbow Design: Ideal for tight spaces and clean routing
• 3/8" Tube x 1/4" Thread: Allows transition from threaded ports to larger tubing
• Leak-Free Seal: EPDM O-ring ensures reliable, long-term performance
• High Flow Capability: 3/8" tubing supports increased flow vs 1/4" lines
• Durable Construction: Typically polypropylene or acetal body
• Lead-Free & NSF Certified: Safe for potable drinking water use

📌 John Guest fittings use a collet locking system that securely grips tubing and allows easy removal without tools

Compatibility

This 1/4" thread x 3/8" push-fit elbow is compatible with:

• Reverse osmosis systems (especially higher flow setups)
• Under-sink filtration systems
• Ice makers and refrigerator lines
• Coffee machines and beverage systems
• Water coolers and dispensers

Works with:

• 3/8" OD polyethylene (PE) tubing
• PEX tubing
• Nylon or soft copper tubing

Specifications

• Product Type: Fixed elbow (90° push-fit x threaded)
• Tube Size: 3/8" OD
• Thread Size: 1/4" NPT male (standard)
• Material: Polypropylene or acetal
• Seal Material: EPDM O-ring
• Max Pressure: ~150 PSI (varies by material)
• Max Temperature: ~140°F (60°C)
• Certifications: NSF 51 & NSF 61

Applications

The 1/4" x 3/8" Fixed Elbow is ideal for:

• Connecting RO systems to higher flow tubing lines
• Transitioning from valves, housings, or manifolds to tubing
• Tight under-sink installations
• Beverage and coffee equipment setups
• Ice maker and fridge water connections

It is especially useful when:

• Upgrading from 1/4" to 3/8" tubing for better flow
• Reducing pressure drop in longer runs

Maintenance & Installation Tips

• Cut tubing clean and square before inserting
• Push tubing fully into the fitting for a proper seal
• Use PTFE (Teflon) tape on threaded connections
• Avoid overtightening into plastic ports
• To remove tubing, press the collet and pull out the tube

💡 These fittings are widely used because they offer fast installation, reliability, and consistent leak-free performance in water treatment systems.