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ToughTek: P20, P30, P30ht, P30X, P40
Material is too thick to push through the hose without packing out.
Hose is too restrictive
Thin and mix material thoroughly to a lower viscosity if material supplier allows.
Use a pump system priming fluid (dish soap or slicking agent) to wet out the system.
Reduce length and/or increase diameter of hose.