Can I play devils advocate?
Padi Tec 40 CCR lists AOW, Enriched Air Diver, Deep Diver or with proof of 10 dives to 100 feet, and Rescue Diver.
If so, that's not a dig on the instructor for asking for it, it's a requirement of the Padi training.
I think most instructors work like this: If something happens and training is cancelled, the money is only refundable if they can fill that slot. If they can't, then you forfeit the money and have to pay again when you want to resume training. You are essentially hiring their time, not guaranteeing the results, because students can always fail, etc.
So you show up with this used rebreather and on day 2 there's an oring that fails on the canister, or an old loop that rips a bit, your flood recovery skills aren't perfect, unit ends up completely flooded in salt water. Solenoid corroded, o2 cells rusting, and worse, the jacks to plug them in, corrode. Unit has to be sent off for service, and your instructor can't rebook the time, now you are paying for the overpriced instruction twice.
Granted, that's a bit extreme and even a complete flood can probably be resolved without significant issue, but that's why I'm playing Devils Advocate
A better, middle of the road approach, would be for the instructor to say "buying a used unit comes with risks. Lets review as much as possible and I'll help you with the list of wear items that should be replaced like hoses, o2 sensors, orings, loop, etc. You can order the parts yourself, and for a half day's instruction fee I will go through the unit with you, teaching you how to replace those parts as we go."
That way you avoid an unnecessary service, but accomplish any necessary service.
If he uses an old fabric covered optima with hammerhead electronics, no wonder he's not a huge fan. Time for an upgrade!
Padi Tec 40 CCR lists AOW, Enriched Air Diver, Deep Diver or with proof of 10 dives to 100 feet, and Rescue Diver.
If so, that's not a dig on the instructor for asking for it, it's a requirement of the Padi training.
I think most instructors work like this: If something happens and training is cancelled, the money is only refundable if they can fill that slot. If they can't, then you forfeit the money and have to pay again when you want to resume training. You are essentially hiring their time, not guaranteeing the results, because students can always fail, etc.
So you show up with this used rebreather and on day 2 there's an oring that fails on the canister, or an old loop that rips a bit, your flood recovery skills aren't perfect, unit ends up completely flooded in salt water. Solenoid corroded, o2 cells rusting, and worse, the jacks to plug them in, corrode. Unit has to be sent off for service, and your instructor can't rebook the time, now you are paying for the overpriced instruction twice.
Granted, that's a bit extreme and even a complete flood can probably be resolved without significant issue, but that's why I'm playing Devils Advocate

A better, middle of the road approach, would be for the instructor to say "buying a used unit comes with risks. Lets review as much as possible and I'll help you with the list of wear items that should be replaced like hoses, o2 sensors, orings, loop, etc. You can order the parts yourself, and for a half day's instruction fee I will go through the unit with you, teaching you how to replace those parts as we go."
That way you avoid an unnecessary service, but accomplish any necessary service.
If he uses an old fabric covered optima with hammerhead electronics, no wonder he's not a huge fan. Time for an upgrade!