... /2 "or G1 1/4"Biggest suction: six metersSingle-phase pneumatic diaphragm pumps is professionally applied for printing machinery. Operating principle ... of light weight, elegant appearance, not rust, corrosion resistance, etc.7.The product is suitable to ink, ethanol, toluene, acetone, glue ... six M5 hex screws, lesting the spring jumped out. QDM902 Pneumatic Diaphragm Pump