This plastic nozzle will also avoid the accidental insertion of the catheter into the snakes trachea and causing the snakes death. It may sound like a silly mistake that most people would never make, but I have known a few inexperienced people to do exactly that.. Another advantage in the plastic nozzle is that it provides a less than harsh lever to pry the snake's mouth open. I generally find that gentle manipulation under the rostral area with the nozzle is all that is needed for the snake to open its mouth.
It is advisable when treating small snakes with potentially dangerous drugs to use the smallest syringe as possible to accurately measure the desired dosage correctly.
When feeding down the catheter it is important to keep the snake body as straight as possible to ensure that it travels down the oesophagus with out obstruction.
I find that holding the snake's body vertical with its head up helps to achieve this. It is important that when doing this that its body weight is supported and that when it is so handy to have assistance from a second person. You should never continue if you can feel any resistance.