What Liquid Is Used In Sprinkler? When a sprinkler head has a glass bulb, that bulb typically contains a glycerin-based liquid. Once the air around the sprinkler reaches a certain temperature – often 155F or 200F (68C or 93C) – the liquid expands which causes the glass to break. Can you put antifreeze in a
How Is An Upright Sprinkler Head Different From A Pendent Sprinkler Head? Upright sprinklers are installed with deflectors above the sprinkler, while pendent sprinklers have deflectors below the sprinklers. Common industry practice is to use upright sprinklers in areas without finished ceilings and pendent sprinklers in areas with finished ceilings. What is an upright sprinkler?