Hello I looked through the internet pages and found your company. We are the Hydromaks Company that is situated in Kazan. For now we are interested in the DK fittings, its the russian standard of fittings. i sent you in the attached file the picture of the fittings we need. the fitting must be flexible, so we need the fitting we can disconnect. in final we wanna have the nipple, the nut and the plastic ring (that stop the nut). IT IS SHOWN IN THE PICTURE! the fitting must not have the o-ring (rubber ring)!!!!! Looking forward to hearing from you soon. :) I want to receive: Product Spec . Price Payment .