It seems like ages since you have been able to buy these parts new. Well here at wax racing products we have you covered.
Introducing the wax thruster series pipe. These will come with over sized adjuster screws for the water injection so you don't snap them the second you try and adjust.
These bolt up to our manifold we sell as well as a lot of other manifolds out there for both Yamaha and Kawasaki .
The injection points on these pipes are a restrictor and not a tap. When you get the header pipe you need to seat the top of the screw which has a reverse cone and will cut a small seat on the casting. Basically put the adjuster screw in with grease and tighten down firmly. run them back and forth a few times down on the seat and it will cut its only little seat and allow the restrictor to work. We normally run about 3/4 on the low speed screw and all the others closed but this of course depends on the way you ski is plumbed
Of course as per always this includes the free shipping which comes std with all the wax racing products.