Somebody wayy back in 2016 couldn’t find it either and I still can’t ! Was changing out my slave cylinder and this is the connector to the line !

 

Please provide us some information on your year, trim, etc Accord you drive.

 

2000 accord coupe manual LX 4-cylinder !

 

That adapter is not part of the OE diagram, so I'll guess that someone installed a replacement line and needed the adapter to connect to the slave cylinder.

Can you remove that adapater, or is it destroyed?

 

The same thing happened to me as this guy! It broke after I punched through the little hole and took out the adapter! There was some resistance but I didn’t think it was broken! I bought a new slave but it requires that part !

 

Maybe this part will work? 46941-S5A-003

EDIT: This is for the TSX and some Civics. You may want to take the fittings to a honda dealership to see what will fit in there. It looks like that adapter is part of the clutch line on the Accord diagram. Hope this adapter fits.

 

This is likely part of the clutch hydraulic line.

Honda TSB 98-084

 

Not sure if Honda/Acura part # 46941-S5A-003 may work. 46941-S5A-003 is usually held in with either 2 roll pins or a U-shape retaining clip. The 2000 Accord uses one roll pin.

For illustration purposes, the following are related to an Acura ILX which utilizes part # 46941-S5A-003.

 

Honestly that looks like a Dorman piece from the "Help" ailse at OReilly's. It's some sort of adapter. Normally that flare fitting on the hose goes straight into the cylinder without that extension. Maybe a previous owner changed that hose and got the wrong one and it wasn't long enough?