- Cleans condensate drains easily by sucking debris out of the drain.- If the job is tougher than that, you can also use the cleaner to inject clean water to flush the drain line.- It's not necessary to open the plenum to get at the drain, simply insert the Jiffy Condensate Cleaner to the drain hose and flush.- There is no danger of "blow back" like you might experience with a pressurized drain cleaner and there is no problem with running out of pressure before the job is done.