If you’re looking for a fluid level indicator (FLI) with a locking cap for your heavy-duty vehicle, contact Orscheln Products. Orscheln Products provides locking fluid level indicators and created the patented Twist2Lock® Fluid Level Indicator product line. This line of fluid level indicator products has been designed to work with a wide variety of engines and transmissions, depending on whether you chose the F1, F2, F3, or F4 designs. With a wide range of options for fluid check, check/fill, or fill options and multiple choices for tube materials, Orscheln’s fluid level indicators are engineered to be suitable for many different engine or transmission applications. For more information about Orscheln Products’ locking fluid level indicators, including the patented Twist2Lock® Fluid Level Indicator product line, contact the Sales Team at Orscheln Products.