Hardi sprayers are made of unobtainium.  Just go to the dealer and ask him for prices on parts. You better sit down for that.

I just priced a electric motor with gears which bolts to the top of the ON/OFF boom valve. Friggin'  $650.  I should start manufacturing aftermarket parts for Hardi. I'd be rich.  At those prices they can give away the sprayers and still come out on top by just selling parts for crying out loud.  The next sprayers will not be Hardis!!!