For the old NWB 150int Classic 150int skimmer with a 6" body its comparable upgrade in pump would be the Bubble Blaster 2000 as stated on our website: http://www.coralvue.com/reef-octopus-bubble-blaster-2000-skimmer-pump. The adapter is available as a drop down if you buy the pump through us, or if you have the pump and just need the adapter just head here: http://www.coralvue.com/bubble-blaster-pump-output-adapter and select 2000 threaded and put in the model of the skimmer body it is mating up to.
The Bubble Blaster 1000 is fair upgrade to the NWB110 or now Classic 110int.