The Kranzle HD Portable Series was originally designed for the Hire Trade where heavy duty, low maintenance and exceptionally long life expectancy is a must. They have rapidly gone on to become the preferred choice of professional detailers and valeters due to their compact size and durability. All Kranzle valve housings are manufactured from a unique forged brass, with a 10 year anti-corrosion guarantee - they cannot wear out! 'Cheaper' machines often seen in high street stores have electric motors that are designed to only last as long as the pump, which unbelievably is just 40 - 50 hours.