Thetford Large Shelf Clip is for use with the top shelf.
Fits Thetford Deluxe models N100, N100LED, N104, N108, N109, N110, N112, N115 & N145LED.
 
Fits Thetford Premium models N100, N104, N109, N112, N145, N150, N175 & N180.
 
Fits N3000 series models N3100, N3104, N3108, N3112, N3115, N3141, N3142, N3150, N3170 & N3175.