UML Pro-Sensor rearm kit (Generation 2) These are the parts you need to get your Dan Buoy ready for its next use, after you have deployed it in training or rescue. These parts may also be used to service many inflatable life jackets with Halkey-Roberts V90000 / Alpha Inflator inflation mechanisms. Using the parts in this kit, servicing your SOS Marine dan buoy is recommended every third year whether or not you have deployed it.