Duct tape don't stick to squat! Everything I've ever used it on, it has come off. I have no idea why it has the reputation it has, and why so many people are ga-ga over it.
Tammy, THANKS for that link. Just Liners has really low prices on pumps, and parts, too. Coincidentally enough, my Pondmaster 700 has a leak in the front housing, and I was thinking I'd have to get a whole new one. At $85, it's not a bad price. But I can buy parts and replace the impeller and volute for about $20. Incredibly cheap!