SENTRY Legacy GT™ + GS (GS20HT6LCZ) for Legacy Installations in the UK complies with the new IGEM/G/5 Ed. 3, 2022 for gas in multi-occupancy buildings.
The Legacy GT™ thermal cut-off device (TCO) in combination with a GS excess flow valve (EFV) is the first TCO that can be screwed directly onto the outlet of a gas meter emergency control valve (ECV with BS 746 connection).
This product is specifically designed for existing installations in the UK and can be installed without disrupting the gas supply to neighbouring properties. It provides additional protection to a meter installation with < 1.0 mbar (10 kPa) pressure drop.
Legacy GT™ thermal cut-off device (GT20BLCO) is also available separately.
See product literature here (PDF).