Brass sight glass Hex

for industrial applicationsthreadedfor high-pressure applications

Overview
The Hex-Duty Oil Sight Glass (OSG) provides a durable, high-visibility inspection point for oil-filled reservoirs and lubricated equipment. Engineered for industrial applications, it enables fast detection of oil clarity issues, water ingress and sediment accumulation while withstanding pressures up to 400 psi.

Design & benefits

• Hexagonal body for easier installation, draining and disassembly; improved grip for tools in confined or awkward spaces.
• Spring-loaded drain valve allows purging of separated water without full disassembly, reducing downtime and maintenance risk.
• Clear cast acrylic construction provides immediate visual detection of water, sediment and oil degradation.
• High-pressure rating (up to 400 psi) suitable for pumps, gearboxes and high-load systems where standard sight glasses fail.

Installation
Mount the OSG to the lowest reservoir drain port so heavier particles and water settle into the sight glass. For side-mounted ports, use an elbow adaptor to position the unit vertically for reliable drainage. Ensure thread compatibility (NPT adaptors available) and tighten to recommended torque to avoid leaks.

Key specifications

• Materials: Cast acrylic body; brass nipple and drain valve (optional stainless steel hardware)
• Temperature range: −40 °C to 93 °C (−40 °F to 200 °F)
• Pressure rating: Up to 400 psi

Available configurations

• 1 oz (1/2 NPT) bottle — compact for small reservoirs
• 3 oz (3/4 NPT) bottle — higher capacity for larger systems
• Optional stainless steel hardware for corrosive environments
• Optional magnetic drain valve for ferrous particle detection

How it helps manage water contamination
The Hex-Duty OSG gives maintenance teams immediate visual confirmation of water ingress—a primary cause of premature wear. The spring-loaded drain enables quick purging of accumulated water without system disassembly, helping to extend component life and reduce unplanned downtime.

Technical specifications

• Commercial name: Hex-Duty Oil Sight Glass (OSG)
• Brand: Lubretec
• Materials: Cast acrylic body; brass nipple and drain valve (optional stainless steel hardware)
• Operating temperature: −40 °C to 93 °C (−40 °F to 200 °F)
• Pressure range: Up to 400 psi
• Drain: Spring-loaded drain valve; optional magnetic drain valve available
• Compatible installations: Pumps, gearboxes, tanks and most oil-lubricated equipment; mounts to lowest reservoir drain port (elbow adaptor for side ports)
• Configurations: 1 oz (1/2 NPT), 3 oz (3/4 NPT); optional stainless hardware; optional magnetic drain valve