- Messages
- 19,941
- Reaction score
- 18,861
- Location
- Philadelphia and Boynton Beach
- # of dives
- 1000 - 2499
I was certified in Southern California in 1970, and dived for two years with just a J valve, watch, and capillary depth gauge. I added a SPG in 1972 and dived with my J valve down. I much preferred knowing how much gas I had in my steel 72, modern technologyI have a J valve. I don't need any spg.