John Crane Type 2100 Replacement Mechanical Seal

A Compact, Unitized Alternative for Standardized Pump Chambers

The Type 2100's defining feature is its unitized build — the entire seal arrives as one fitted assembly rather than separate components requiring individual measurement, which is what makes it genuinely quick to install compared to older bellows designs. Its bellows geometry is pressure-supported rather than free-flexing, so it holds its shape without creasing or folding under load, and its dimensions are built to match DIN 24960, ISO 3069, and ANSI B73.1 seal chamber standards directly. That standardization is exactly why it's become common across wastewater treatment, pulp and paper, and general water-based process pumps — plants can specify it once and expect it to fit across a wide range of equipment. Our equivalent follows the same unitized dimensions, so it drops into those same standardized chambers without adjustment. Full installation and fitment guidance is available in our blog.