This is the Highland Standard Power Inflator - Lower Unit Only Features: Strong and reliable Able to service in the field with TL126 Inflator Tool and BPH20 Replacement Cartridge Attaches to 1 (25 mm) diameter corrugated hose Comes as shown with cable attachment pin There is good reason why this Highland inflator is found on technical rigs from the Jersey Coast to the Florida Caves. It is strong and dependable. Its reliability comes from its simplicity. Best of all, the unit is completely serviceable, in the field, by changing out the Power Shaft Cartridge (p/n BPH20) using the Highland Inflator Tool. Available as a complete airway assembly or just the lower unit only."