CRL CleanRTP: Clean Rapid Transfer Port Safe. Clean. Flexible. The new Central Research Laboratories CleanRTP is the cleanest and most flexible transfer system on the market Advantages Easier to clean: Smooth, clean surfaces, no exposed fasteners Easier to operate: Port interlocks enable user to open door without manual latch operation Easier to configure: Flexible port door design Stainless Steel Polypropylene Liquid Transfer