Hydrostatic release unit

hydro release unit2-year disposable unit with no maintenance cost

The Hammar H20 hydrostatic release unit is designed for liferafts from 6 to 150 persons. There's also a special Hammar H20 Small Rafts model for non-SOLAS liferafts - 4-12 persons.

How does it work? It's simple really. The white strong rope is secured to the deck or liferaft cradle and attached to the liferaft lashing with a sliphook. If the ship sinks, the water pressure will, within 4 metres, activate a sharp knife that cuts the white strong rope. The liferaft will then float free.

As the ship sinks, the liferaft painter line will be stretched and the liferaft will start to inflate. The Red Weak Line™ will then break and survivors can board the floating liferaft.

The Hammar H20 needs no annual service, no maintenance and no spare parts but it must be replaced within two years of being installed onboard.




High tech range from Kannad including SART models.

Spare parts

Be prepared with the right spare parts that work regardless of the weather conditions or changes in climate.


Talk to a Survitec Group expert in your area

Auckland: Peter Legg, Tel: 09 306 8604  > Email
Wellington: Jason James, Tel: 04 499 9179  > Email
Nelson: Paul Scholfield, Tel: 03 548 2996  > Email
Christchurch: Adam Cross, Tel: 03 389 2117  > Email
Rest of South Island: Dave Chapman, Tel: 03 539 1373  > Email