Brand new Quincy air compressor unloader tower diaphragm, part # 1855. This diaphragm measures about 3-1/8" across and made out of a reinforced rubber.  This diaphragm is designed for models 250, 325, 370, 390 and 5120 air compressors that need part # 1855.

Features:

• Qty: 1  # 1855 Diaphragm
• About 3-1/8" across
• Unloader tower diaphragm
• Part # 1855
• Reinforce Rubber