*PLUMBERSSTOCK EXPERT* responded:
Hello there! Thank you for posting a question about the K-Rain P1009955 Timing Pins. For easier identification, timing pins for the Hydrotech 1000 and 2000 series are identified by their color and not by their length. For example, this P1009955, which is for a 15-minute run-time, has a white color. The 1009956, which is for a 7-minute run-time, has a yellow color. The 1009957, which is for a 3-minute run-time, has an orange color, while the 1009959, which is for a 1-hour run-time, is black. For more information, please see this Installation and Troubleshooting Guide. We hope this helps. Thank you for choosing PlumbersStock. Have a great day!