Spare Cap for Foam Cannon Pro

How the caps on spare bottles are allowed to be so useless, when the main foam gun cap is so great, is beyond me.
The extra caps LEAK no matter how hard you tighten them since there is no included rubber or silicone gasket/o-ring.
Is the one star warranted? Well - It's a cap. It has one job, and it fails at it.
Useless design flaw!

It's a cap

Horrible company. Ship times are crazy long with no communication to the customer the products are coming from china. If you want to wait several weeks for your product this is the horrible company you want.

As expected, very good mjjc quality.
Note- A cap should come with each foam cannon purchase, period...

I never received the bottle all the cap. There's your review.