The Large kit contains the capsules to install -10, -12, -16 hose into their respective sockets. To accommodate all the different manufacturer’s fittings, spacers and sleeves are required to tighten up some of the sockets within the capsule. For the tool to perform at its best, the socket needs to be a snug fit into the funnel. In the 1016 kit, all the -16’s except Russell’s require the sleeve and a rear spacer. See the instructions in the case for the proper spacer number. Most of the -10’s and 12’s* will use a spacer. Not for use with Teflon-style hose. * -12 is a stainless washer.