Rectorseal83113 EZ 113 Trap, 3/4-Inch, RED and White, 0.75 Inch

I replaced this to fix a problem of water getting into the low pressure switch on our Lennox furnace. Repair guys said it was a circuit board problem, very expensive. After reading some information on line about condensate pumps and their purpose I realized something with that wasn't working. I took out the original trap and it was plugged. The condensate pump was filthy and wasn't working properly. I bought this trap followed the installation instructions, cleaned the pump, tested it, and what do you know... problem solved!

Every central AC should have this. Visual and easy to clean. Many installation don't even have the flimsy p-trap and that a mistake. Search Youtube to see why a p-trap is required beyond odours control. If you are in a condo you should even get the model with a high water switch that stops the AC when there is a clogging. I was administrator for a condo and funny enough AC spilling was the most common source of water damage despite having mandatory annual inspection of AC systems. Many technicians won't bother to clean the drain pipe/tube.

I realized recently, that my hvac drain tube had no p-trap inline, and so i got this kit. Went on well, I glued the ends of the "U" pipe. Works well and makes it easy to clean line.

I've had the AC technicians to my house so many times to figure out why the AC water drain was backing up. They'd tell me the plumbing didn't have enough of a gradient to it and that was they problem. So I had the plumbing redone. It still didn't stop the AC water overflows, which result in the AC shutting off. After opening the pipes myself I realized there was a very strong suction back towards the AC unit. This was strong enough to suck the water back into the unit that should have been draining. (To be fair, that might have not happened with a steeper slope on the drain pipes.) They might have been partial right, but after some research I found out about this device. The U shape filled with water is enough to stop the suction from pulling water back into the AC unit. The full water in the U curve stops the air inflow. Then as water trickles in gravity takes over and it drips out the drain pipe.Ingenious device. Easy to install. I can't believe professional AC technicians from 2 different companies didn't know to put one of these in. They sell a version of these at hardware stores, but this one is much better. Easier to work with. The fact that it is clear and has valves you can open means you can see if it is clogging up and easily open it for cleaning. Get this one. I don't think I'll have to touch the AC unit again.

This rocks! Super easy, and combine with a flush out hose connector, the whole line can be cleaned in 10mins! We’ll worth the price to have a well functioning P-trapPer the leaks, non if you glue it like normal pvc pipes. Once I got it all set, glue the transparent part on first upside down so glue will pool & seal slightly at each joint. Plus keeps purple primer from sliding down into the clear area.