Gerand’s product line consists of Venturis, Indicators (orifice type) and Balvalve-Venturis (one-piece unit, fixed Venturi and valve) manufactured by Gerand and meters used to balance the hydronic and air systems.
Venturis and Indicators are furnished with a set of meter fittings (nipples, valves and quick disconnects). Balvalve-Venturis have nipples and quick disconnects.
A chained metal tag is furnished with all flow devices. The tag shows the unit size, unit location, the GPM and corresponding meter reading in inches of water
For further information please see at http://wmaflow.com