Purpose of a little pin in thermostat valve in mehran

awaissyed1414 (Awais Syed) 2021-03-06 16:27:57 +0500 #1

Aslamoalikum
What is purpose of little pin in thermostat valve? A little pin located at edge on valve body

aforashfaqahmad (ASHFAQ) 2021-03-06 18:21:01 +0500 #2

i think to prevent air locking