Oteco 114504 Gate Valve Splash Guard creating a barrier against contaminants Silicone creating a barrier against contaminants Silicone nose cup is soft and comfortable for all day wear Polycarbonate lens with wide field of vision maximized peripheral visions plus downward view for high impact Wide viewing area provides distortion free visibility and optical clarity Five point strap option includes center strap to help position and hold the mask for a more secure fit and offers quick Knife edge contacts for both inside and outside measurements One hand use with the thumb operated XX Connections Schedule B : 8481803010 4BWXX 4" Model 72 450 Standard Service Gate Valve Assembly