To perform optimally, propane grills require low, consistent pressure between 11" and 13" psi. This pressure is significantly lower than the high 100-200 psi pressure that comes straight from a propane gas tank. Regulators are vital - they reduce tank pressure to the 11"-13" psi range. Excess pressure could prevent your grill from lighting reliably without a regulator or cause uncontrolled bursts of flame. Investing in a quality regulator lets you safely achieve the low 11"-13" psi flow your grill needs for efficient, even cooking.