Receptor for the C-terminal sequence motif K-D-E-L that is present on endoplasmic reticulum resident proteins and that mediates their recycling from the Golgi back to the endoplasmic reticulum. Upon ligand binding the receptor oligomerizes and interacts with components of the transport machinery such as ARFGAP1 and ARF1. Localized in the Golgi in the absence of bound proteins with the sequence motif K-D-E-L. Trafficks back to the endoplasmic reticulum together with cargo proteins containing the sequence motif K-D-E-L. Phosphorylation by PKA at Ser-209 is required for endoplasmic reticulum retention function. Belongs to the ERD2 family.