Well the pvc piping can be any size you want, i would use like 1 inch inner diameter tubing for the pvc u can get an end cap for one side and run like 4 or 5 microsrpayers, there i think 1/4 diameter, so u could get that size drill bit just make holes and screw them in. You make it just one strait set up instead of the cornered one, so its just one tube, one side gets endcap the other gets an adapter to fit the 2/3 tubing, when you go to get the pvc, just bring a small piece of the pump tube your using and find all the pieces u need not sure on the fitting for the pvc to pump line, becuase the 1 inch innerdiameter on the pvc will have i dont know the size outer diameter. Its really something u just fit in the store, homedepot should have everything, i find alot of the smaller stores have the more unfindable parts. it shouldnt be too hard. i mean all u really need is a big tube in the middle with the sprayers and the 2/3 outer diameter tube for the pump and for it to connect, sizes and fittings is what u can find and pretty much what works. u can use all different sizes.