Julio,
The NWB150 has always had the OTP pump. The replacement pump you would need to purchase is the following:
http://www.coralvue.com/reef-octopus-otp2000gt-skimmer-pump
Do you have pictures of the old pump that came with the skimmer?
In terms of the Gave Valve, you would need the 40mm one.
http://www.coralvue.com/reef-octopus-protein-skimmer-40mm-gate-valve
You will also need the following part - Diameter: 40mm | Length: 180mm - (unless you are willing to cut the one you currently have in which case, you won't need this part:
http://www.coralvue.com/reef-octopus-skimmer-output-a-pipe-521
Hope this helps,
Carlos Chacon
CoralVue