The Apeks US1 First Stage is a compact unsealed diaphragm first stage designed for use in warm water and is intended as the first stage for a redundant gas system that only requires a second stage and pressure gauge.
The US1 has just one low pressure port and one high pressure port which significantly reduces the size of the first stage.
- Unsealed system for warm water diving
- No turret
- One low pressure port 3/8" UNF
- One high pressure port 7/16" UNF