Comparison : Item # 2066-4-4S, 2066 Internal Pipe Swivel (NPSM) to SAE O-Ring Boss
Item # 2066-4-6S, 2066 Internal Pipe Swivel (NPSM) to SAE O-Ring Boss
Item # 2066-6-6S, 2066 Internal Pipe Swivel (NPSM) to SAE O-Ring Boss
Item # 2066-6-8S, 2066 Internal Pipe Swivel (NPSM) to SAE O-Ring Boss
Item # 2066-8-8S, 2066 Internal Pipe Swivel (NPSM) to SAE O-Ring Boss