T/Y Corrugated Coupler, Connects to 3-in. and 4-in. Pipe

I thought it was a bit expensive, but it is the only way that I could find to join two 4 inch drains into a single outlet. It is flexible and fits the 4" corrugated drain hoses perfectly, although the user should be prepared to tape the joints if water leaking is any kind of issue. Gorilla makes a special rubbery black duct tape that is a couple of dollars more than their very good black duct tape, and it prevents leaks at the joint.

does what it is supposed to do

It is cheap made. Little flimsy to suit my liking. The y comes off when you go to snap it back on the main pipe the main pipe flexes in. That's how flimsy it is. The big box store sells the same one. I would like to have had a better option. I hope it doesn't come back to bite me.. I recommend trying to find a better option..... Was making a French drain....

Does not connect to 4” or 4” adapters, is very flimsy and it is also only $5 at Home Depot and Lowe’s

Used this to connect two downspouts to one drainage pipe. solid construction, flexible neck, I expect this will last quite a long time as long as it's not exposed to extreme weather.

Only one of the openings fit a 4 in. The others need a coupler to fit a 4 inch pipe.

It does the job. The flex part of the T/Y fitting is detachable as well.

Arrived complete but late