1AA20MR16

For hydraulic applications where you need an ORS connection, the Aeroquip 1AA20MR16 is an ORS R2 MM fitting meant to make a secure, reliable connection in demanding service.

ORS stands for O-Ring Straight, which is a thread style that uses an O-ring to seal the connection rather than relying on thread interference alone. R2 refers to the hose type compatibility, in this case a high-pressure two-wire braid hydraulic hose. MM just means both ends are male. So what you've got here is a male-to-male adapter fitting with O-ring straight threads on both sides, built for hydraulic line connections where a leak-free seal under pressure is the priority.