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You need a pretty tight fit with your mouse (but not too tight) and the more powerful the vacuum the better. If you have more than a couple of 90º bends it gets dicey as the fish tape can get hung up on the inside radius of the 90º. If I have long runs with multiple 90ºs, I add a pull string as I assemble. Can you split the run anywhere convenient and pull half way?
all a sewer tape is, is a really heavy duty steel fish tape, but was designed for punching a hole in a blockage, I was thinking of suggesting one, it would be much stiffer than a small electrical tape and in a large conduit I think it would work well, I have never tried one as I have never dealt with that large conduit on the farm here,
Push sticks/blocks Save Fingers
"The true measure of a man is how he treats someone who can do him absolutely no good."
attributed to Samuel Johnson
PUBLIC NOTICE: Due to recent budget cuts, the rising cost of electricity, gas, and oil...plus the current state of the economy............the light at the end of the tunnel, has been turned off.
I remember pulling beverage lines to the bars in clubs and hotels. The payoff was at the end when you had to flush the lines out with what they were going to dispense, like rum or coke or 7-up.
Good thing we didn't have drug and alcohol testing on the job back then.
"When we build let us think we build forever. Let it not be for present delight nor for present use alone. Let it be such work that our descendants will thank us for, and let us think, as we lay stone upon stone, that a time is to come when these stones will be held sacred because our hands have touched them, and that men will say, as they look upon the labor and wrought substance of them, "See! This our fathers did for us."
John Ruskin (1819 - 1900)
I think just using a wider fish tape will help with pushing it.. However what seems to be the problem with using a regular fish tape in your 4" pipe? Is it a long run or lots of bends? Shouldnt be more then 360* worth of bends. You can try and put a larger head (bend the end of the tape wider) and that may help too. It should have a bent tip on it anyways, a straight flat tip will just get hung up on something. Try twisting the tape as well. Also, if you have a vac and don't have a mouse, a string tied to a plastic bag usually works in a pinch.
In a pinch I've taped a soda bottle on the end of the fish tape. Most of the time we use a shopvac or an air compressor. A plastic grocery bag made into a "parachute" blown down the conduit works well.