Product review (5 stars): Cheap and easy fix, LG model WM3987HW
This fits the "drain side" of the LG model WM3987HW washer/dryer pump assembly. When you open the front panel by sliding it off, the drain pump is on the left side. And the recirculate pump is on the right.

Both pumps should be quiet if they are working properly. Both of mine were making loud "clanking" and "churning" noises. I cleared the drain tube with a plumbing snake and I cleared the recirculate rubber tube by blowing into one end after removing it from the pump. It cleared out the lint build up. But when I put the pump back into the machine the drain pump still only pumped weakly and made loud noises.

I opened it up and found the attached pictures- a bent impeller and found tons of wet lint around the impeller. This trough is designed to take on debris. But hair had wrapped up around be impeller and bent it.

This pump replaced the bad one. And now my machine is washing like it was brand new. It's an easy replacement job. Look up guides on YouTube. All you need is a pair of pliers or vice grips for the hose clamps and a good Phillips screwdriver and some patience. You can do this.

PICURES ARE OF BE BAD PUMP THAT NEEDED REPLACED.