Sight Glasses & Gauge Valves – Level Gauge – Model 3520

1/2"-3/4" NPT - Top-Bottom Connections

Rugged flat glass gauge for liquid level indication. Standard construction includes a solid one-piece chamber machined from bar, forged steel covers, alloys steel bolts and nuts, and tempered glass.


  • All gauges tested to 1.5 times rated pressure at 100°F
  • Available in reflex or transparent styles
  • Wetted parts conform to NACE MR0175/ISO 15156
  • Optional 316 SS bolts & nuts, plus 3-coat paint system for optimal protection in corrosive environments

If you would like additional information, please click on any literature link below or Contact Us directly so that we may provide you with detailed specifications.




*Product Summary Catalog
PDF Size: 1.2MB
Level Instrumentation Brochure
PDF Size: 1.5MB