Well if you have not got the poly yet anything from 3/4 to 1.5 will work just remember don't freak out first time you kick it in it may take a while for your air to actually get to your fusers at that length and diameter of pipe. At the end of your poly run you can always reduce the size of pipe to fit the 5/8ths inch inside diameter weighted hose you should use to go out into your pond with. I wouldn't do it any other way...
DG8 makes a good point about the check valve but a lot of diffusers have them built into the fuser so you don't have to run a chk valve in the line itself. So it kinda depends on your fuser. For sure put a liquid filled 25 psi pressure gauge on your pump... I got mine from Mr. Bill Cody he may be able to get you one. Or know where to send you for one. Check Esshup out also another member on this site. He knows his stuff about air and has a lot of parts and things....
Good Luck sounds like your on the right track,
RC
Last edited by RC51; 06/20/17 01:51 PM.
