They have been tested, and function fine - a bit of vibration / noise, but move quite smoothly. This item is in the category "Business & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Valves & Manifolds\Other Valves & Manifolds".
The seller is "bayview21" and is located in this country: CA. This item can be shipped to Canada, all countries in Europe, all countries in continental Asia, United States, Mexico, Brazil.