Sight glasses for inspection of oil and liquid

Overview – ConstructionInstallationCatalogue

sight glasses with moisture indicator for refrigerants
Indicators without sensitive element are normally installed on the compressor to monitor the oil level or on the receiver to monitor the liquid level.

Available versions

IGLOO indicators have a complitely hermetic construction to prevent refrigerant leakage. It’s not possible to dissassembly IGLOO indicators because the glass is clamped into the brass body and sealed thanks to a ring of special PTFE (Teflon®).

100% tested: max leak 1 gram/year

IGLOO sight glasses are tested one-by-one against leakage with helium up to 70bar (1,015psi) and we recommend a Maximum Working Pressure MWP of 48bar (700psi) and a Maximum Test Pressure of 70 bar (1,015psi).
During lab tests IGLOO sight glasses broke at the impressive pressure of 290bar (4,200psi) without explode: the security factor adopted is more than 6X, among the highest in the industry.


IGLOO glass indicators are suitable for all the most common CFC, HCFC and HFC refrigerants such as R22, R134a, R404, R410, R507 and Carbon Dioxide CO2 R744 (sub-critical). Not suitable for ammonia R717.


  1. sweat version have two copper swaged connection suitable for brazing using common alloys such as Cu-Ag or Cu-P. In case of brazing with aluminum tubes we recommend the use of Zn-Al alloys: enquiry our technical dept for more information about
  2. the extra-long and extra-thick ODS swaged connection reduce the possibility of damaging both the moisture indicating element and the PTFE gasket
  3. threaded version have standard SAE Flare connections, male-to-female (external-to-internal) or male-to-male (external-to-external)
  4. by adopting an optimal forging with extremely high mechanical strength the overall design is characterized by a total weight reduction: the body is up to 30% lighter comparing to the competition and the burst pressure (290bar or 4,200psi) is one of the highest among the industry