Refrigeration Sight Glasses
Refrigeration sight glasses are available in multiple body styles and connection configurations. The three product series below cover ODF welded connections, SAE flare connections and compact flare-type models in the listed sizes.
Product: Refrigeration Sight Glass
Product Series: 3
Connection Options: ODF / SAE
Listed Size Range: 1/4″ to 1-1/8″
Listed Configurations: 28
Product Series & Specifications
The three sight glass series below are organized according to the supplied technical drawings. Each series uses the dimension letters shown on its corresponding drawing, allowing buyers to compare connection size, body dimensions and overall length directly with the specification table.
Design & Function
- Designed for liquid lines in refrigeration and air-conditioning systems to provide a clear visual indication of refrigerant flow.
- The sight glass can also be used to observe moisture condition in the refrigerant and, in suitable applications, the flow condition of lubricating oil in an oil-separator return line.
- Depending on the series, the sight window uses a compression or separable construction with tempered glass and PTFE or O-ring sealing components.
- The separable design allows the sight-glass assembly to be removed for service or maintenance on applicable models.
- For welded models, high-frequency welding concentrates heat in a small weld area, helping reduce the heat-affected zone and produce a more uniform weld surface.
Moisture Indication & Working Conditions
- Moisture-indicating models use a color indicator: green indicates no dangerous moisture condition, while yellow indicates excessive moisture content in the refrigeration system.
- Applicable refrigerants: R22, R134a, R404A, R407C, R410A and R507C.
- Applicable medium temperature: -40°C to +80°C.
- Applicable ambient temperature: -30°C to +80°C.
- Maximum working pressure: 4.2 MPa.
Construction details and operating characteristics may vary by series. Please select the required model using the dimensional tables below and confirm the connection type and application conditions when requesting a quotation.
Series A – ODF Welded / SAE Connection Sight Glass
This series is available with welded ODF tube connections and SAE flare connections. ODF sizes are listed from 1/4″ to 7/8″, while SAE sizes are listed from 1/4″ to 3/4″.
| Specification | Connection Type | A | B (mm) | C (mm) | D (mm) | E (mm) | PCS/CTN |
|---|---|---|---|---|---|---|---|
| 1/4″ | ODF | Ø6.35 | 7 | 101 | 17.5 | 7.5 | 162 |
| 3/8″ | ODF | Ø9.52 | 9 | 119 | 17.5 | 7.5 | 162 |
| 1/2″ | ODF | Ø12.7 | 10 | 146 | 21 | 9.5 | 96 |
| 5/8″ | ODF | Ø15.88 | 12 | 146 | 22 | 11 | 96 |
| 3/4″ | ODF | Ø19.05 | 13 | 173 | 23 | 13.5 | 96 |
| 7/8″ | ODF | Ø22.23 | 15 | 174 | 22 | 14.5 | 96 |
| 1/4″ | SAE | 7/16-20UNF | 14 | 64 | 16 | 9 | 126 |
| 3/8″ | SAE | 5/8-18UNF | 15 | 67 | 16 | 9 | 126 |
| 1/2″ | SAE | 3/4-16UNF | 19 | 73 | 19 | 12 | 126 |
| 5/8″ | SAE | 7/8-14UNF | 18 | 74 | 19 | 12 | 55 |
| 3/4″ | SAE | 1-1/16-14UNF | 21 | 82 | 22 | 14.5 | 55 |
Series B – ODF Welded / SAE Connection Sight Glass
This second body style is also available in ODF and SAE configurations. The ODF range extends to 1-1/8″, with dimensions differing from Series A as listed below.
| Specification | Connection Type | A | B (mm) | C (mm) | D (mm) | E (mm) | PCS/CTN |
|---|---|---|---|---|---|---|---|
| 1/4″ | ODF | Ø6.35 | 7 | 101 | 14.5 | 8.5 | 162 |
| 3/8″ | ODF | Ø9.52 | 9 | 119 | 14.5 | 8.5 | 162 |
| 1/2″ | ODF | Ø12.7 | 10 | 146 | 16.5 | 11.5 | 96 |
| 5/8″ | ODF | Ø15.88 | 12 | 146 | 18 | 13 | 96 |
| 3/4″ | ODF | Ø19.05 | 13 | 173 | 20 | 14 | 96 |
| 7/8″ | ODF | Ø22.23 | 15 | 173 | 21.5 | 15.5 | 96 |
| 1-1/8″ | ODF | Ø28.57 | 18 | 212 | 23.5 | 18.5 | 96 |
| 1/4″ | SAE | 7/16-20UNF | 14 | 64 | 14.5 | 8.5 | 126 |
| 3/8″ | SAE | 5/8-18UNF | 17 | 70 | 14.5 | 8.5 | 126 |
| 1/2″ | SAE | 3/4-16UNF | 19 | 76 | 16.5 | 11.5 | 126 |
| 5/8″ | SAE | 7/8-14UNF | 19 | 76 | 18 | 13 | 55 |
| 3/4″ | SAE | 1-1/16-14UNF | 20 | 88 | 20 | 14 | 55 |
Series C – SAE Flare Sight Glass
Compact flare-type sight glass with SAE thread specifications from 1/4″ to 3/4″.
| Specification | A | C (mm) | D (mm) | E (mm) | F (mm) | PCS/CTN |
|---|---|---|---|---|---|---|
| 1/4″ | 7/16-20UNF | 80 | 19 | 9 | 16 | 108 |
| 3/8″ | 5/8-18UNF | 89.5 | 24.5 | 9 | 16 | 108 |
| 1/2″ | 3/4-16UNF | 97 | 27 | 12 | 19 | 108 |
| 5/8″ | 7/8-14UNF | 100.5 | 30.5 | 12 | 19 | 108 |
| 3/4″ | 1-1/16-14UNF | 112.5 | 34.5 | 14.5 | 22 | 108 |
How to Select
Please specify the required series, nominal specification, connection type and quantity. For ODF models, confirm the tube diameter shown in column A. For SAE models, confirm the listed UNF thread specification.
Frequently Asked Questions
What connection types are listed?
The supplied specifications include ODF welded connections and SAE flare connections.
What is the largest size shown?
The largest listed nominal size is 1-1/8″ in the Series B ODF range.
How should I request a quotation?
Send the required series, specification, connection type and quantity. If you are matching an existing part, include the relevant dimensions from the table.
International Buyer & Sourcing Information
Refrigeration sight glasses are commonly sourced by HVAC/R importers, refrigeration parts wholesalers, distributors, maintenance suppliers and equipment manufacturers looking for visual refrigerant-flow and moisture-status indication components. This product range includes multiple body and connection configurations for different refrigeration piping requirements.
For quotation and sourcing, buyers should specify the required series, connection type, size and quantity. We can review the requested configuration and provide product information for wholesale, distribution and export orders.
Need Refrigeration Sight Glasses?
Send us the required series, size, connection type and quantity for quotation and model confirmation.