The BPUC union straight is a nickel-plated brass straight connector available with metric and inch tube outside-diameter options. Select by the tube outside diameter (O.D.), its measurement system and the required pack quantity.
BPUC product specifications
- Model: BPUC.
- Product type: union straight connector.
- Material: brass with a nickel-plated finish.
- Metric tube O.D. options: 4, 6, 8, 10, 12, 14 and 16 mm.
- Inch tube O.D. options include 1/8, 5/32, 1/4, 5/16 and 3/8 inch.
- Pack quantity options: 5 or 10 pieces.
How to select a BPUC connector
- Identify the tube outside diameter, not its inside diameter.
- Check whether the tube specification uses millimetres or inches, then select the corresponding tube O.D. option.
- Confirm any unclear variant size label before ordering.
- Select a pack of 5 or 10 pieces.
Tube sizing questions
What does O.D. mean for this product?
O.D. means outside diameter. The BPUC tube size options describe the outside diameter of the tube, not its inside diameter or a pipe thread size.
Can I substitute a nearby metric size for an inch size?
Do not assume that similar metric and inch sizes are interchangeable. Match the selected BPUC option to the tube's specified outside diameter and measurement system.
Does selecting an inch size mean this is a metric-to-inch reducer?
The product is listed as a union straight connector with metric and inch size options, not as a metric-to-inch reducer. Do not infer mixed-size compatibility from the availability of both measurement systems.

