There are several types of connectors available in 2 sizes (1/2" and 3/16"). The connectors are used to connect the pipes to each other (T-), to divide them in 4 (derivation in cross “X”) or derive them to 90 degrees (junction in “L”). Please note that the only connector capable of switching from a large 1/2" pipe to a small 3/16" pipe is the T-lead 8333.