... and drugs resistance 3) Small resistance to fluidity Water adapter fittings The water adapter fitting range of inch-size push-in ... fittings is offered for tube size 1/4" O.D to ... 1/2" O.D. The fittings are manufactured in white Polypropylene with food grade silicone. They ... ,SUT,ST,SST,SY,SCVU,SMJ,SPP ect Water adapter fittings