What part of the injector is this?

thinking of buying these , but how do they fit?

do you take apart the injectors and insert these new jets?

confused  :dontknow:

Thanks!

They are the injectors, held in by the o rings you can see on the middle two. they just pull out although they may be very tight. then they just screw on, on the top thread. that may be quite tight as well.

ok thanks