S, There are some O-rings that participate in the 'snapping' on and sealing of the injectors--Make shure you get a set--or eventually get a set--usually required when the injectors are disturbed for any reason- You Don't want a vaccume hole!
If you haven't removed the injectors, be shure to pull from the metal, and not from the hose--Or your going to be replacing more than you intend..............
G-luck....................S
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