Male screw adaptor Non-poison, corrosion-resisting, high mechanical strength, low brittle temperature and long life wearing; Little liquid resistance, uneasy-fouling, non-polluted to liquid but making larger efficient pipe diameter Insulating from oxygen, thoroughly abolishing permeation able to use for communication linef+s shield, combating various kinds of sound frequency disturbing, anti-magnetic field disturbing, with anti-static electricity nature, suitable for gas-/oil-transferring and curving pipe or making pipe straight back. For aluminum-plastic compound pipe, every person can install Easy-installation, curved without self bounce, so with reliable efficiency Less joint for pipes, long life wearing and less investment Non-poison, non-lust, non-fouling or non-germ.