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316.029C 1/2"Nipple Drinker with 4-Wrench Flat for finishing hogs or sows

G-1/2" thread (European pipe thread) or NPT-1/2" (Amercian pipe thread) is favorable  
complete stainless steel body is made from diameter 21mm hex rod

With diameter 8mm pin
adjustable plastic filter with stainless steel neting.   
adjustable plastic filter is easy to change high pressure water systems and low pressure

water systems.   
NBR 90 O-ring is permanent and protect leaking
individual packing or bulk packing is favorable.
stamping or laser printing logo is favorable.