1,Glass PH electrode sheath material 2,Glass PH electrode 3,PH electrode Glass pH electrode sheath ... size :G1-1/4"NPT Threaded connectorBuilt - Pg13.5l thread HT-2 size :3/4"NPT threaded connector,size according to custom ... lengthmaterial:PP material ,PVC materialHT-3,HT-4":3/4"NPT hreaded connector size according to custom ...