 |
| |||
| tell at a glance (With the rising stem (выдвижной шпиндель) the operating engineer can tell at a glance whether the valve is open or closed BorisKap) | |||
|
| |||
| tell at a glance (With the rising stem (выдвижной шпиндель) the operating engineer can tell at a glance whether the valve is open or closed BorisKap) | |||