| Brand | DUCO® |
| Type | Sight Glass |
| OD | 5/8" |
| Material | BOROSILICATE 3.3 GLASS |
| Wall Thickness | 1/8" (3.18 mm) |
| Item Length | 6-3/4" |
| ID | 13/32" (10.3 mm) |
| Country Of Origin | China |
DUCO® RED-LINE Boiler Sight Gauge Glass (5/8" OD x 6.75" L) for High-Pressure Steam Service. Steam boiler service working Pressure Depending on local code, RED-LINE sight gauge glass is required.