We receive a lot of calls asking if we handle “Aeroquip” hose; what folks are really asking is if we carry 100R5 hose. The R5 hose is the textile covered hose that is assembled with reusable fittings to allow the hose to be repaired in the field when necessary. I think the confusion factor is the difference between type AI and type AII hose and fittings. Type AI is found as original equipment on most trucks and is generally replaced with type AII hose. The AI hose and the fittings are still available; however, they are not very popular. Assembly of the AI fitting uses a mandrel for assembly, whereas the AII does not. I know, the AI can be assembled without the use of a mandrel, however, you run the risk of cutting, or skiving the inside of the hose, the liner. The fittings on the type AI hose, although they are reusable, will not work on the type AII hose, and vise-a-versa. The AI and the AII markings can be found on the socket of the fitting and on the lay line on the hose. Another difference to be noted is the O.D. of the AI hose is smaller than the O.D. of the AII hose.
The two examples below show the differences. The fitting on the left is the AI and as you can see it does not have hex nut H1, also the tail of the fitting is shorter. It stops just before the end of the socket, whereas the AII tail extends out past the socket. The AII is a non-mandrel type fitting and the most popular.
The AII hose has a higher pressure rating and is useable for a larger variety of fluids that the AI and that is why the type AII is the most popular with hose shops around the country. It does everything the AI does and more