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Background/Aims: The current study was undertaken to assess if the semi-solid formulas could be used with a new ENFit connector with similar force to current percutaneous endoscopic gastrostomy (PEG) tubes. Methods: Experiment 1: We measured the applied pressure (force) needed to compress the syringe containing 7 viscous semi-solid formulas with a 20 Fr PEG tube and low-profile tube through the ENFit connector or the current connector. Experiment 2: This experiment was conducted to evaluate the compression force through 2 connectors in 3 infusion velocity, 7 PEG tube types with 2 semi-solid formulas. Results: Experiment 1: The force needed to compress the syringe through the ENFit connector was higher in 3 semi-solid formulas with a 20 Fr low-profile tube; otherwise, there were no significant differences. Experiment 2: Each formula required a higher force in the ENFit connector in 6 settings out of 21. Conclusions: The ENFit connector will likely not show any remarkable change in the force to administer the semi-solid formula. However, a higher force was required under some conditions in the prototype ENFit connector. Further investigation of sensory test is needed to confirm the feasibility of the ENFit connector for using the semi-solid formulas.