Filled with an inert liquid such as silicone oil in the bottom of the oil bubbler.Used to observe the gas flow rate. 

* Glass Material: made from borosilicate glass, offer exceptional chemical and heat resistance. 

* beautiful appearance: uniform wall thickness, no bubbles and durable. 

* Serrated design: ensures a secure grip on hoses, preventing slippage during connections. 

* Customizable: They can also be customized as per one’s requirement.