BU1/8 joins two sections of 1/8 in outside-diameter tubing end-to-end, without a threaded port.

Yes, for compatible tubing and operating conditions. Cut both tube ends squarely and insert them fully into the separate push-to-connect openings.

A straight union connects matching tube diameters. A reducing union connects different tubing outside diameters and may introduce an additional flow restriction.

It can reconnect a damaged or shortened pneumatic tube run, extend a line or provide a detachable connection during an equipment modification, subject to the installation specifications.

The published all-metal B-Series range is specified for compressed air and vacuum service, subject to compatible tubing, proper sealing and the limits of the assembled system. Other fluids need separate compatibility confirmation.

The published fitting-family limits extend from full vacuum to 176 psi (12 bar, as listed for the fitting family), with a fitting temperature range of -40 to +248 °F (-40 to +120 °C). Actual system limits also depend on tubing, seals and installation; do not treat these as fluid-compatibility certifications.