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| DS4 first stage only |
| Apeks |
| Environmentally dry sealed version of the US4 1st stage with 4 medium pressure ports (3/8"unf) ... |
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| Mk17 First Stage Only |
| Scubapro |
| First Stage:- Machined marine grade chrome plated brass body- Overbalanced diaphragm design- Dry amb... |
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| UST4 first stage only |
| Apeks |
| Diaphragm actuated, swivel turret, balanced 1st stage. Shares the same high performance of the DST v... |
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| Mk25AF First Stage Only |
| Scubapro |
| An unfailing performance, due to patented design The MK25 first stage can accept all types of SCUBAP... |
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| DS1 first stage only |
| Apeks |
| Compact environmentally sealed 1st stage with one 3/8 medium pressure port and one 7/16 high pressur... |
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| US1 first stage only |
| Apeks |
| Compact first stage with one 3/8" medium pressure port and one 7/16" high pressure port. N... |
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| Mk2Plus First Stage Only |
| Scubapro |
| Simple elegance best describes the Mk2Plus. It offers a combination of simplicity and reliability in... |
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| SP5 First Stage |
| Oceanic |
| The SP-5 offers all divers the opportunity to own a top-performing regulator at an unbeatable price.... |
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| US4 first stage only |
| Apeks |
| Compact unselaed 1st stage with 4x 3/8 medium pressure ports and one 7/16 high pressure port.... |
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| Alpha Oxy |
| Oceanic |
| Factory cleaned and assembled in a clean room environment with special O-rings, halocarbon based lub... |
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| Safety Second 1 Red |
| Atomic |
| Safety Second 1 alternative air source and inflator from Atomic.PerformanceThe SS1 contains a high f... |
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