If you've got an X5 steam mop and the water tank cap has seen better days, these replacement caps are exactly what you need. This 2-pack gives you a spare for when (not if) you need it down the road. Made from quality plastic that's durable and heat-resistant, so they'll stand up to regular use. The sealing performance is actually really good - no leaks or steam escaping where it shouldn't. They're manufactured to original specifications, so they fit perfectly without any modification needed. Installation is straightforward - just pop off the old damaged cap and snap this one into place. Having two means you can keep one as a backup for when the first one eventually wears out. The black color matches the original equipment, so it looks like it came with your mop. No more dealing with a broken cap that doesn't seal properly or worse - having to replace your entire steam mop because of one small broken part. These caps are affordable and solve that specific problem perfectly. Keep your steam mop working like new without the expense of buying a whole new unit. It's one of those simple replacement parts that extends the life of your appliance significantly.