The Rothenberger 7.3297 Uni Spanner is a professional combination stepped key for fast installation and removal of radiator valve nipples, counter-threads, tank connectors, and short tap extensions. Designed to prevent slipping and canting, it’s the ideal tool for tight heating and plumbing connections where accuracy matters.

Made from hardened chrome vanadium steel with a nickel-plated finish, the Uni Spanner is built for durability and corrosion resistance. Its special stepped design keeps nipples and screw connections aligned during use, reducing the risk of rounding or mis-threading.

The tool features a 1/2" square drive and provides cam, internal hexagon, and 12-edged (double hexagon) fittings to cover multiple common sizes — giving you one compact solution for a range of valve and tap applications. For quicker work, it’s compatible with a 1/2" ratchet, allowing smooth, efficient turning in confined spaces.

Key Features:

• Stepped combination spanner for heating and plumbing fittings

• For radiator valve nipples, counter-threads, tank connectors & short tap extensions

• Special stepped key design prevents canting and slipping

• Hardened, nickel-plated CV steel for long service life

• 1/2" square drive for ratchet use

• Cam, internal hexagon & 12-edged fittings

• Sizes covered: 3/8", 7/16", 1/2", 5/8", 3/4"

• Quick installation/removal with 1/2" ratchet compatibility