Wow!!! There was a "Speed Bump" with my order when they went to crate up my pump they discovered that their provider had made changes to the pump. They contacted me with options and I chose to wait on the pump that I ordered. Communication and Follow Thru was flawless.
The pump arrived yesterday and it was the pump that I ordered. It looks like a quality replacement and it measures out matching the spec's on the Web site.
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

