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This manifold is used to connect inert gas/vacuum sources. The all glass stopcocks consist of glass plugs and lower vacuum chambers. The top right connection is for using inert gas and the lower left is for vacuum connection.

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4121 Vacuum Manifold, Double, All-Glass, with Vacuum Chamber - Manufactured by NDS Technologies, Inc.

Vacuum Manifold, Double, All-Glass, with Vacuum Chamber, 3 Ports, #2 Hose Connection, 4mm Glass Stopcock, 280mm Overall Width
List Price $866.41
4121 Vacuum Manifold, Double, All-Glass, with Vacuum Chamber - Manufactured by NDS Technologies, Inc.

Vacuum Manifold, Double, All-Glass, with Vacuum Chamber, 4 Ports, #2 Hose Connection, 4mm Glass Stopcock, 365mm Overall Width
List Price $1,129.12
4121 Vacuum Manifold, Double, All-Glass, with Vacuum Chamber - Manufactured by NDS Technologies, Inc.

Vacuum Manifold, Double, All-Glass, with Vacuum Chamber, 5 Ports, #2 Hose Connection, 4mm Glass Stopcock, 450mm Overall Width
List Price $1,362.53
Product Name N/A Vacuum Manifold, Double, All-Glass, with Vacuum Chamber
Number of Ports N/A 3 N/A 4 N/A 5
Hose Connection Size N/A 2
Stopcock Bore Size N/A 04 mm
Approximate Overall Width N/A 280 mm N/A 365 mm N/A 450 mm
Pkg. Qty. N/A 1