Check the listing for details. Baker SG403A / SG403 4ft Biosafety Cabinet Replacement Sash Window Pistons. Condition: New – Open box. Listed at 583.00 USD. (Left & Right) P# 23947 RH & LH Is the sash window on your Baker SG403/403A biosafety cabinet not staying up? Or leaning to one side? Is there a broken string on the sash piston? It is likely that your sash pistons are bad/worn/broken. Replacing those pistons can allow for proper operation of the sash window. This listing is for a set of (1) left & (1) right sash pistons These pistons are used on most Baker SG403/SG403A BSC's ***You must confirm with me for SG403 units -Works on all Baker SG403A units. -Baker SG403AHE units do NOT use these pistons THESE PARTS ARE OBSOLETE FROM THE MANUFACTURER OEM part number 23947RH & 23947LH Why throw out a working biosafety cabinet when you could just fix the sash window?