SODIAL(R) 1" Thread Diameter Air Compressor Fittings Clear Plastic Oil Sight Glass Product Name : Oil Level Sight Glass;Material : Plastic Color : Clear, Black, Red;Thread Diameter : 26mm/ 1"" Overall Size : 38 x 22mm/ 1.5"x 0.87"(D*T) Net Weight : 11g Package Content : 1 x Oil Level Sight Glass