High pressure tip broke while I changed to the low pressure tip in less than two weeks.Water Pik Pressure slowly declined to a complete stop in one month.I have called WaterPik twice, their answer system has failed to xfer my calls to customer service.Comes with a one year warrranty and a 14 day money back guarantee!I'll keep you updated until I receive a refund or replacement.IMHO, Amazon might consider to dump selling this product.So far, a total waste of my time and my money!I am totally unhappy.Maybe you should AVOID this item and thank me later.