Final answer:
If a high or low pressure propane hose needs a new fitting, it should be replaced to ensure proper functioning and safety.
Step-by-step explanation:
If a high or low pressure propane hose needs a new fitting, you should replace the fitting to ensure proper functioning and safety. When connecting the hose to a propane tank or other device, it is important to use the correct fitting to prevent leaks and potential hazards. Inspect the hose and fitting for any signs of wear or damage before replacing it. Make sure to follow the manufacturer's instructions for installing the new fitting and ensure a secure connection.