Redding Reloading 7in Powder Measure Reservoir w/cap. Reservoir included.This reservoir assembly features a 7-inch length. All Redding Powder Measure Complete Vacuum Powder Measures require two separate reservoirs one per caliber although some multi-caliber models may work with two reservoirs designed for the Quick-Chain. If you have a Redding Powder Measure that does not have the reservoir function you will need to purchase a separate reservoir unless you are using an ultra-micro scope to measure very small calibers. Specifications for Redding Reloading Powder Measure Reservoir w/cap: Manufacturer: Redding Reloading Length: 7 in Additional Features: w/cap Quantity: 1 Package Contents: Redding Reloading Powder Measure Reservoir w/cap Redding Reloading 99165: 7in Powder Measure Reservoir w/cap