Filter housing series are manufactured in the structure fast fightening and not quite requiring TEFLON processing, with specically designed connecting part which is the international patent. Also, using double safe rings, it shuts off the leak of the fluid perfectly, and you could use them clean always. Our product able to with stand water-hammering symptom(weight : for the use of 930g/10″) occurring inside the housing by strenghtening body and cap parts in order to meet the demand of consumers.