Des-Case Oil Level Indicator (OLI) – Clear Visual Monitoring for Oil Reservoirs Available from Armor Industrial – Your Source for Proactive Lubrication Monitoring The Des-Case Oil Level Indicator (OLI) allows maintenance teams to quickly and clearly monitor oil levels and conditions in tanks, gearboxes, and reservoirs. Built from high-strength, transparent polyamide, the OLI provides a real-time view of lubricant volume without opening the system. Designed for easy installation, each indicator includes 1/2” NPT threads on both ends. Red and green markers allow operators to set high and low limits or mark running and idle oil levels. The OLI mounts directly at the reservoir’s drain port, delivering continuous, visual feedback. Key Features Clear Oil Level Visibility The see-through tube shows oil level and color, making it easy to identify low levels or contamination at a glance. Durable Construction Made from chemically resistant polyamide, the OLI handles tough industrial conditions without degrading or cracking. Easy Installation Each model comes with dual 1/2” NPT male threads for fast setup on standard reservoir ports. Color-Coded Reference Markers Red and green rings let technicians set level benchmarks to support consistent monitoring and alerts. Multiple Lengths Available Choose from 3” to 30” lengths to suit different reservoir sizes and sightline requirements. Optional Accessories Add a non-desiccant breather with 0.3µm filtration or the OLI Headspace Vent Kit for complete fluid system protection. The Des-Case OLI improves maintenance efficiency by helping teams spot issues early and reduce unplanned downtime. Whether you’re checking tanks, gearboxes, or hydraulic reservoirs, the OLI keeps your team informed—visually and reliably. Please choose from the options above. To order the right model for your system, contact Armor Industrial, your trusted provider of Des-Case fluid monitoring products. Find more products from Des-Case Additional information Type 3"/ 76 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, 6"/ 152 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, 9"/ 229 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, 12"/ 305 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, 15"/ 381 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, 18"/ 457 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, 21"/ 533 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, 24"/ 610 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, 27"/ 686 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, 30"/ 762 mm Oil Level Indicator – 7/8" OD – 1/2" Male NPT on each end, Non-Desiccant Breather & Coupler – 0.3um filter – oleophobic – hydrophobic, OLI Headspace Vent Kit
