Glass Key Stopcock T Bore – Precision 3-Way Laboratory Glass Valve
The SGC LABS® Glass Key Stopcock with T Bore is crafted from
Borosilicate Glass 3.3 with a precision-ground tapered key plug featuring
a T-shaped bore. This unique bore geometry creates three ports
(one on each side of the barrel plus one through the plug tip), enabling selective
routing of liquids or gases between any two of three connected lines — making it
the standard choice for laboratory manifolds, vacuum switching, and multi-reagent
delivery systems.

What is a T Bore Stopcock?
In a T bore stopcock, the channel through the plug is shaped like
the letter “T”, connecting three openings instead of two. By rotating the
plug 90° or 180°, the operator can:

Connect Port A to Port B (while Port C is closed)
Connect Port A to Port C (while Port B is closed)
Connect Port B to Port C (while Port A is closed)
Connect all three ports simultaneously (T open position)

This flexibility makes the T bore the preferred choice over straight bore or
oblique bore for multi-line switching applications.

Key Features

Material: Borosilicate Glass 3.3 – chemically resistant, autoclave-safe
Bore type: T-bore (3-way) – three ports, multiple switching positions
Plug: Precision ground tapered glass key plug
Bore diameter: 2mm and 4mm
Barrel sizes: 8mm, 10mm, 12mm, 15mm
Seal: Vacuum-tight when properly lubricated with stopcock grease
Resistant to acids, bases, organic solvents, and aqueous solutions
Conforms to: ISO 4797, DIN 12244

T Bore vs Straight Bore vs Oblique Bore – Quick Comparison

Bore Type
Ports
Best For

Straight Bore
2-way
Burettes, single-line flow control

Oblique Bore
2-way
General flow control, slower delivery

T Bore
3-way
Manifolds, vacuum lines, multi-reagent switching

Applications

Vacuum line manifolds and Schlenk line setups
Gas distribution and switching in inert atmosphere work
Multi-reagent addition in organic synthesis reactors
Venting one line to atmosphere while maintaining vacuum in another
Column chromatography solvent switching
Pharmaceutical process development labs

Why Choose SGC LABS®?
Each T bore stopcock is individually ground and paired with its barrel —
the plug and barrel are lapped together to ensure a perfect vacuum-tight fit across
all three ports. Manufactured in Ambala, India and exported to 40+ countries,
SGC LABS® stopcocks are trusted by research institutes, pharmaceutical companies,
and universities worldwide.