
Bubble Traps - Sight Glass
Douglass Sight Glass Bubble Traps are specialized components used for observing fluid flow while effectively trapping and removing air bubbles. These traps consist of a durable glass viewing window and a robust housing that allows for continuous monitoring of liquid systems.
OUR WARRANTY
100% Satisfaction Guarantee
Douglass warrants merchandise against defective workmanship and materials that become apparent within a period of 12 months from the date of receipt of invoice by the purchaser (hereinafter referred to as the warranty period). All liabilities under the warranty provisions shall expire when the warranty period has expired. Please feel free to contact us if you have any questions or comments.
SHIPPING AND PACKAGING
At Douglass, we use a unique and patented packaging method that minimizes the risk of glass damage during shipping. This system ensures your products arrive in perfect condition, just as we would like to receive them ourselves.
We understand that not all glass is the same, so we tailor our packaging techniques based on the type and quantity of products you order. This ensures maximum protection for every shipment.
Designed for easy integration into pipelines or tanks, the bubble traps offer a clear view of the fluid, ensuring that air pockets are removed to prevent disruptions in flow or system performance. With a simple installation process, they provide reliable, realtime observation, making them ideal for industries where fluid clarity and consistency are critical.
Sight Glass - Key Features
Effective air bubble removal
Sight Glass Bubble Traps are specifically designed to capture and eliminate air bubbles from the liquid flow, enhancing system efficiency and stability. This feature is crucial in applications where the presence of air can affect process accuracy or performance.
Clear and continuous liquid flow visualization
With a high-quality, durable glass window, Sight Glass Bubble Traps provide real-time observation of liquid flow. This ensures continuous and effective monitoring, which is essential in industries where fluid clarity and consistency are critical.
Easy installation and maintenance
Designed for seamless integration into existing systems, Sight Glass Bubble Traps do not require welding, simplifying both installation and maintenance. Their streamlined structure reduces downtime and associated costs with repairs or replacements, making them a practical and cost-effective solution.
High durability and pressure resistance
Sight Glass Bubble Traps are built to withstand harsh operating conditions, including high-pressure environments. By selecting appropriate materials and glass thickness, these traps can be customized to handle extreme pressures, ensuring long-lasting performance and reliability in demanding applications.
Sight Glass Bubble Traps - Parts and Materials

| Item | Part name | Material options |
|---|---|---|
| 1 | Allen Bolts |
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| 2 | Tapper |
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| 3 | Gasket (max temp) |
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| 4 | Protection Rods |
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| 5 | Sight Glass |
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| 6 | Part 6 |
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TECHNICAL INFORMATION
| A (Total length) | 480 mm |
|---|---|
| B (Field of view) | 280 mm |
| C (Base size) | 250 mm |
Flow Sight Glasses DOUGLASS flow sights with bubble traps allow the user to observe the process in question to monitor abnormal colors or densities in the fluid.
Due to their design, these sights are used to remove bubbles that naturally form in processes such as distillation, evaporation, and various chemical reactions. The most common measurements in which they are manufactured are with 3 sanitary CLAMP connections. The central connection supplies the fluid to the system, and the lateral one drains the same fluid. This type of sight is commonly used in distilleries and chemical processes where fluid mixing causes unwanted gases in the system.
Installation Instructions for Sight Glass Bubble Traps (Douglass Brand)
Tools and Materials Required: • Welding machine • Welding rods/electrodes (appropriate for materials) • Torque wrench (calibrated) • Gaskets (as specified, typically non-reusable) • Bolts and nuts (as specified) • Protective gear (welding mask, gloves, etc.)
