Alrighty.. as promised, heres a small video of it. Unfortunately only the first 7 seconds show the nozzle, and even then sort of underwater, i apologize. I'll b getting out this weekend i'll get a video of it. Now, as EVERYONE has probably already said, invest in a metal one. I plan to this summer. Why? I already broke my first one(the one in the video ironically). Probably already due to outward pressure already forced on the pipe from the inside, it split down the very center of one of my 45 elbows. It also doesnt help i was probably banging that sucker around XD
So, your "jet" is what.. 1/2" now? So you took a trash pump that only has a max PSI of say 55(im being generous, i think mines 45). Thats full bore, AT THE OUTLET. Thats not counting hose, bends, or restrictions. Now, taking into account fluid dynamics, you get a thing called friction loss along the length of the hose. This robs the water of velocity, kind of like your damper in your dredges? it slows water down right? well, that same force is exerted all along that hose. So, you've taken a 2" and restricted it down to 1.5". Now your pump is instantly pushing that water through a smaller hole and having to push the entire length through a smaller hose, which equals more friction loss as there is more surface area for the amount of water in the hose to "grab" on to, again, robbing your water of precious velocity through the hose. Then you take it to 3/4 along a good length, and finally to that 1/2 where it doesnt have a whole lot of pressure left as its lost most of it through all those restrictions and smaller diameter hose.
Take 2" pipe, from your pump, too your nozzle, there, you can only neck it down to about 1" to 3/4" I'd say maybe 7/8". But the reason for this is you NEED volume to push the water up the hose. You don't have PSI to play around with. You're not using a pressure pump or a dredge pump.
So heres how I make a nozzle.
For the suction part itself, i start out with a 2" ABS T, or one of these:
2 in. ABS DWV H x H x H Long-Radius Tee-C5812LHD2 - The Home Depot
Looking at the part on the website its oriented "top" where your "jet" will enter, to bottom where your hose to your sluice will go with that suction being the long turn.
From there, take a 2" to 3/4" reducer and build out the front going back to the hose coming from your pump.
What I did with the one in the video, was as above, and then from the 3/4", get a 1" 45, a 1.5" 45, and a 2" 45. Take the 1" 45, heat up one end with a heat gun, and then when its pliable, stick the 3/4" 45 in there and make sure you glue it with pvs/abs glue!! Keep doing this for the 1" -1.5", 1.5"-2". And use pipe as necessary to build it up/support. Its pretty darn strong when you use PVC glue and get it all tight. My issue was I banged on it too much due to clogs it sucked so hard :P
You'll get the general idea after my video. I'll get another one this weekend if I can.
