I ordered parts for my electric smoker and they came promptly. The parts even had instructions on how to change them.
Water distributor housing for: asa/ada/a
Water distributor housing for: asa/ada/aua50/70, asa/ada/aua51/71 & si 500/700 s/d
Buy this part and as many parts as you like and pay only $9.99 shipping, within the Contiguous United States.