Collection: Cock Liquid Level Gauge / Glass Tube Liquid Level Gauge

Factory-direct cock liquid level gauges and glass tube liquid level gauges — simple, reliable instruments for direct visual monitoring of fluid levels in low-pressure tanks, water towers, storage vessels, and process equipment. The borosilicate glass tube connects to the vessel via cock (valve) fittings, allowing the fluid level inside the tube to mirror the level in the tank. Easy to install, maintain, and replace. Custom lengths and configurations available.

How It Works

The glass tube is connected to the tank at two points (top and bottom) via cock valves. The fluid level in the transparent tube rises and falls with the tank level, providing a direct, real-time visual reading. The cock valves allow the tube to be isolated and replaced without draining the tank.

Key Properties

• Glass tube material: Borosilicate glass — chemical resistant, high clarity, long service life
• Max. operating temperature: Up to 200°C
• Max. operating pressure: Up to 10 bar (low-pressure models)
• Connection: Cock (needle/ball) valves — BSP, NPT, or metric thread
• Tube OD: Standard 10mm, 12mm, 14mm, 16mm — custom available
• Tube length: 100mm to 1500mm — custom available
• Full-view models available with 360° visibility

Cock Level Gauge vs. Flat Glass Level Gauge

Typical Applications

• Water storage tanks and towers — level monitoring
• Chemical storage vessels — low-pressure fluid level
• Food and beverage tanks — hygienic level gauging
• Boiler feed water tanks — pre-boiler level check
• Industrial process tanks — general fluid level monitoring

Compatible Accessories

Replacement borosilicate glass tubes available in our Borosilicate Glass Tubes collection. For high-pressure applications, see our Level Gauge Glass collection.

Need a custom tube length, thread standard, or bulk order? Contact us for a quote within 24 hours →