The TR-651 filter launch assembly is a replacement part for the TR-600 motor/blower. The filter latch assembly on the TR-600 PAPR should be replaced with a new TR-651, whenever the existing part is broken or worn.TR 651 filter launch assembly is a replacement part for the TR 600 motor/blower TR 602N, as found in TR 600 series PAPR assemblies and ready to use kits. The filter latch assembly on the TR 600 PAPR should be replaced with a new TR 651, whenever the existing part is broken or worn. The TR 651 can be easily installed without the use of tools.