Gardena Pipes and pipe guidance

There are two types of piping. On the one hand, there is the large one that has a circumference of 1/2" which is called connecting pipe. On the other, commonly referred to as the supply pipe, there is the small one that has a circumference of 3/16". Each pipe is 50 feet long. Hence, it is not length that differentiates them, but their circumference. For ease of understanding, one can compare the 1/2" pipe to the trunk of a tree and the 3/16" pipe to its branches.

Pipe Pegs 1/2
New
Pipe Pegs 1/2
Gardena 1328
$14.99
Pipe Pegs 3/16
Pipe Pegs 3/16
Gardena 1327
$13.99
Connecting Pipe 1/2 15m
Connecting Pipe 1/2 15m
Gardena 1346
$44.99
Connecting Pipe 1/2 50m
Connecting Pipe 1/2 50m
Gardena 1347
$104.99
Supply Pipe 3/16 15m
Supply Pipe 3/16 15m
Gardena 1350
$22.99
Pipe Guides and Pegs 1/2
Pipe Guides and Pegs 1/2
Gardena 8328
$13.99
Pipe Clip 3/16
Pipe Clip 3/16
Gardena 8379
$11.99
Pipe Clip 1/2
Pipe Clip 1/2
Gardena 8380
$11.99