Is there a way to manually release air in an automati
Yes, there is a way, and we recommend against it! Read on. All of the Caleffi 5020/5021 Series MINICAL, 5022/5023 Series VALCAL and 551 Series DISCALAIR automatic vents have a spring-closed air release valve under the air vent cap. Most of our air separators and air/dirt separators, such as the 551 Series DISCAL and 546 Series DISCALDIRT have the same mechanism.