Click to expand Tap to zoom Aftermarket Advance 56409387 by Aftermarket No reviews 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Contact Us For Pricing And Availability Description Description Switch Dual. Hydro-Retriever 3800, Retriever 4600, Sr 1600 Replaces Aftermarket Advance 56409387 Fits Hydro-Retriever 3800, Retriever 4600, SR 1600