The Mercury Mercruiser Mariner Force Quicksilver Water Pump Inlet Guide Tube Sleeve is a white-colored sleeve that inserts into the housing and helps align the water tube with the pump.
 
When replacing the water pump on an Outboard or Sterndrive motor, it's important to make sure the water tube guide guides the copper water tube into the water pump.
 
Part Numbers 23-29804, 29804T, 23-52928, 23-29804T
 
9.9 (4-STROKE) (323 cc)
MAGNUM III
V-115 DFI (2.5L)
V-135
V-135 DFI (2.5L)
V-140 (INTERNATIONAL)
V-150
V-150 (EFI)
V-150 DFI (2.5L)
V-175 (EFI)
V-175 DFI (2.5L)
V-200
V-200 (EFI)
V-200 EFI (2.5L)
XR-6 - 0G960500 THRU 1B226999
200 EFI PRO MAX/SUPER MAG
200XS DFI (2.5L)
225 EFI PRO MAX/SUPER MAG
225X EFI PROMAX
R/MR/ALPHA ONE (Sterndrive)
R/MR/ALPHA ONE (Transom Assembly) 
110 Jet (2.5L) 
13.5 (4-STROKE)
140 JET
15 (4-STROKE) 
15 MARATHON XD
150 Pro XS (2.5L) - 1B690542 & Up
175 PROXS (2.5L) - 1B516339 & Up
20 (2 CYL.)
20 JET
25 (2 CYL.)
25, 25 MARATHON, SUPER 15 (2 CYL.)