If you need the entire pump assembly, go to Pelican Parts. If you just need the upper end, without the pump, i.e., the nozzle assembly, then I just found some at a parts house in the SF area.. Send an e-mail to Jeff at
partshvn@ix.netcom.com, and he'll fix you up. I've been looking for one for almost 2 years, and just found it. He said he had a few more.