Ball valve, 2008 & 2007 GTI 130's

[djseadoo]

I am new to PWC's and want to install a ball valve for each unit too make boat towing easier. What size of ball valve do I need to put in, so as not to reduce flow when open?
Thanks
DJ

 

[jonniex5]

I have a 2009 130 GTI SE
I used a 3/4" I.D. plastic valve that has threaded holes.
Then took 3/4" I.D. plastic threaded hose barb fittings screwed it together, cut into the hose and put the valve in line with stainless steel hose clamps. the valve and hose barbs have the same I.D. through it as the hose.
Been riding 2 years with it and no problems. Got everything at Lowe's.

 

[jonniex5]