Hopefully you are joking and if you are in Texas you must have cheated on your Irrigation exam. Reducing the VOLUME of a pipe has no bearing on PRESSURE - what you have suggested is reducing the volume. Since the head in question is a spray head, reducing the volume is going to cause intermittent at best performance of the spray nozzle - hardly a good idea. To the homeowner, you have one of three possible options all of which have been touched upon: 1. Install an MP Rotator 2. Get the hack back out to your residence to tie in the landscape sprays together - or 3. Live with it.