Collection: Reservoirs/Cartridges

The terms are often used interchangeably, and they do the same job: holding the insulin that your pump delivers. Different manufacturers just use different language. Tandem and Medtronic refer to cartridges, while older systems and some accessories use the word reservoir. Both are pump-specific and need to match your particular pump model.

Most people change their reservoir at the same time as their infusion set, so every two to three days. Insulin can degrade over time when it's been sitting in a warm pump or reservoir, so sticking to the change schedule keeps your insulin effective and your dosing accurate.

Yes, they're considered pump supplies and are typically covered alongside your pump and infusion sets. We bill insurance directly and ship resupplies on a regular schedule so you don't have to think about it.

Visit our Resources page for more on what your DME benefit covers.

No, reservoirs and cartridges are designed for specific pumps, and using the wrong one can damage your pump or cause delivery problems. Always match the supply to your exact pump model. We handle this matching automatically based on the pump on file in your account. If you're switching pumps or unsure what you need, our team can confirm before we ship.

Air bubbles can interrupt insulin delivery, so taking a few extra seconds during fills really pays off. Drawing insulin slowly, tapping the reservoir to bring bubbles to the top, and pushing them out before connecting to your infusion set are the main steps. Each pump brand has slightly different filling instructions, and our Learning Center has video walkthroughs for each system.

Unopened insulin should stay in the refrigerator until you're ready to use it. Once opened or in your pump, it's typically good at room temperature for about 28 days, though check your specific insulin's label for exact guidance. Reservoirs themselves are stable at room temperature in their sealed packaging. Keep both away from direct sunlight and extreme heat or cold.