As most Drip Emitters and Drip Emitter Tubing operate between 10 to 60 psi there is usually a wide range to work with but pressure loss must be considered, especially if travelling a long distance between the water source and the start of your Drip Irrigation System. The general rule of thumb is to start bigger to avoid pressure loss issues.
You are now ready to apply this information to your Pumpkin Watering System.
Ref 790