Water Stem Flow W/O-ring Assy (A-dec® #38.0516.00) For A-dec® Century Plus® Control Block Water coolant flow adjustment stem Replaces 24V Volt/150 Watt bulbs in older 6300 lights A-dec® and Century Plus® are a registered trademark of A-dec, Inc. DCI has no affiliation with A-dec and A-dec has not authorized DCI replacement parts to be used on or in connection with A-dec® products.