Stainless steel Breather Valve, Sanitary Rebreather Valve Sanitary Grade, within sping in it, manual operate 1"-4",or required Stainless steel Breather Valve,Sanitary Rebreather ValveSanitary Grade, within sping in it, manual operateSize:1"-4",or requiredUsed in wine, beer, bevarage,dairy fields Stainless steel Breather Valve, Sanitary Rebreather Valve