Liftmaster RSL12U replacement parts shown below. This unit started production in January 2016 to be compliant with the new UL325 standards requiring a monitored safety entrapment device. If you have an Liftmaster RSL12U and need parts you have come to the right place. We stock all of the major replacement parts for the Liftmaster RSL12U slide gate operator.We have a Liftmaster RSL12U parts breakdown that you shows you an exploded breakdown view you can clearly identify the parts you need and order it online from our store. This has been one of the best gate operators on the market for several years, we can help you keep it running even longer.