NRV Nipple Wrench & 5 NRV Valves. This set includes an NRV wrench and 5 NRV backflow prevention valves. It can be used as an NRV wrench for small burners such as Manaslu 121 and Optimus 00 to lanterns such as Ladis and Primus, and as a nipple wrench for Optimus 111.
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