it's also recommended to replace the fiber or nylon washer every time you reconnect the regulator to the tank. if it's deformed at all plastically or there's any sort of creep, you don't want to use it. we are talking about a part that's typically given away free for each tank refill or can be picked up for 10 to 20 cents each. i don't understand the rationale for not replacing them? to save 15 cents?