I know what the push plugs are. I had them inside a kitchen cabinet under a drawer for my Sunnybrook. As far as size of pipe I cannot help you. Mine are fine. What makes you bekiev they need to be replaced? Mine were just a short piece of straight tubing that went from the push plugs and hung straight down thru the floor of the camper allowing water to hit the ground whe opened.
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2019 Ram 3500 Limited w/ Max Tow pkg
2005 Cardinal 33LX
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3) SOLD!
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