DPX Replenishment Bottle Cap

[Mr.Nick]

We have a Mitsubishi DPX System and the cap on the Blue, Activator replenishment bottle cracked, most likely because of it's age.

I'm having trouble tracking anyone down with the same system or someone who might have spare parts. Even the company that it was purchased through couldn't help. 

Don't mind if we need to purchase the entire replenishment set, just the cap would be nice, as well.