i bought a set of DSM 450s from a guy on HMT. they came with the little black caps all busted up. i was wondering if these are necessary for sealing anything or if i can just take them off because i will have the Honda seal on the injectors? The guy at the parts counter at Mitsubishi cant seem to find them, he thinks that you have to buy a complete injector to get them

 

They will work fine

 

What exactly do they do? Direct the spray?

 

No they protect the pintle, be gentle when your installing them and dont drop them.

 

ahh, thanks for the responses!

 

I don't really understand why but these plastic things are always broken. There's not a set of dsm injectors without broken plastic caps.
I have a set of 390's here, 3 of them have broken plastic thingies.