The 4 Lug Female NPT coupling has female NPT threads to screw onto your machine or devise.  The 4 lug end matches up with the 4 lug hose end that you would have on a 1-1/2 inch air supply hose.   In other words, the female end would go on the machine and the 4 lug end would receive your air line.

This 4 Lug Female NPT coupling comes in 3 sizes; All of which are in stock.  Additionally, all of them are made out of plated ductile iron and all have the same size 4 lug end.

Stay Safe by using a safety pin in the pre-drilled hole on the 4 lug side.  Stay even safer by using a whip check cable around your air hose and equipment.

Compatible Part Reference guide for the 4 Lug Female NPT:

• 55-107 One and a half inch air supply hose
• 55-630 Four bolt clamp
• 55-612 Four lug hose end for 1-1/2 red air hose
• 55-901 Four lug air coupling rubber gasket

OEM:

• NECO 21DPFE125, 21DPFE150, 21DPFE200

OEM Equivalents:

• 1-1/4″ Schmidt 4211-107, Marco 10ME3, Dustless Blasting 74470/002
• 1-1/2″ Schmidt 4211-108, 4211-110, Marco 10ME4
• 2″ Schmidt 4211-109, Marco 10ME5

Blue Dog Blasting SKU #:

• 55-520 = 1-1/4″ threads
• 55-521 = 1-1/2″ threads
• 55-522 = 2″ threads