IN STOCK: Lower collection tank for the dirty water sucked up during cleaning. Lower tank has the latch that locks the lid onto the tank. Gray in color. For PowerScub/SpinScru 50 series Steamvacs. FH%0135, FH150140, FH50145, FH50150 thru FH50153. OEM: Hoover.(Part #H-440000001) When sold out the price will show $00.00 3/17/23 d.d.a.