Product review (4 stars): Good replacement for Whirlpool duet Washer OEM bellow
I followed the online tutorial on replacing the bellow for a
Whirlpool Duet Frontload Washer (WFW9400SW04)

The installation instructions were excellent and the bellow installed without a hitch.  As for durability its been in for several weeks and hasn't leaked yet.  I think that pens or normal wear & tear caused the original OEM bellow to rip.  When installing the bellow the hardest part was installing the spring loaded clamp or ring, there is a special tool which I did not have.  I ended up taking off one end of the spring and pulling it together with two pliers.

This is an excellent replacement product!