These fixing trays allow the user to drain the fixing solution and then place filter paper on top of the gel while it rests in the tray. In addition, the solution is recoverable for subsequent reuse. The trays are also useful in electrophoresis gel de-staining. These virtually unbreakable, heavy polyethylene trays are 6.4mm (¬º") thick with a top stiffening flange and 5 ribs in the bottom to raise the gel and plates. Extraction of the plates is aided by 9.5mm (‚Öú") square ridges that run lengthwise holding the plate off the tray. There is a drain stopcock in the side with 1.8 meters (6 ft) Vikem® vinyl tubing 13mm (¬Ω") I.D. This allows more complete drainage of fluid into a receptacle and provides a slower, more controlled drain rate to avoid disturbing the gel. Hooks on the rim of the tray hold the tubing.