Pasco has four models of glass fillers available. There is a 1/4 x 3/8 tubing reducing coupling if you want to convert the ¼” to 3/8”. These are AB1953 Compliant, which means they are lead free. Customers who have ordered these include medical centers, YMCA’s, corporate office properties, public health associations, and colleges. They have 4 models you can choose from: 2040 is our #99114277, 2041 is our #99283488, 2040-TS is our #99192085, 2040-LR is our #99250103.