hydor powerheads
 

does anyone know where you can buy replacement parts for these in canada?

Just write to the company and they'll send you what you need for free. I contacted them a few times and they just ask for your address and send what you need. They have excellent service. :)

Here's the link to the web site, just use the contact us link on the top of the page.

http://www.hydor.com/main/index?sf_culture=en

+1. They have excellent customer service.