Grohe Quick Couplers Reference Guide
46138 000 Yellow/Black version 1 of quick coupler Grohe offered, this coupler did not have a flow restrictor, just a check valve. The flow restrictor is in the pull out head. Coupler Part number 46.138.Introduced in 1997 where there is a Black and Yellow coupler you should replace with a Black and yellow coupler. This coupling is unrestricted flow.
12365 000 Red/Black version 2 is a Red and Black coupler. This coupler was introduced in 2006 and is a combination of check valve and flow restrictor. This flow restrictor is not accessible for cleaning Part number 12.365. If experiencing low flow it can be changed out with a 46 138 or a 46 315 except when it is a Lady Lux Pro, Minta, or Concetto here it should be changed out with a 12 365 Red and Black coupler. This coupler is Restricted 2.2 Gallons per minute
46315 000 Green/Black version 3 is a Green and Black coupler, Part number 46.315 this coupler was introduced mid 2006 to take the place of the 12 365 000, once again this coupler is just a check valve the flow restrictor was moved back to the pull out head. With the exceptation of the Lady Lux Pro, Minta and Concetto. This coupler is Unrestricted
64999 000 Gray/Black or Black/Black version 4 is an all Black coupler and is the WATER CARE version. It limits the flow to 1.5 GPM. The 64999000 comes in 2 colors Black and Black and Black and Gray
48220 000 Brown/Black version 5 is Brown and Black coupler and is the WATER CARE version. It limits the flow to 1.75 GPM. This is introduced on faucets in 2014. The part number is 48220000
