The Sonar Premium Dual Outlet 300 Bar Isolation Manifold is designed and manufactured for long life and heavy use. It has a 215 mm (8.5 inch) adjustable centre to centre crossbar spacing that perfectly fits any diameter scuba cylinders using standard tank bands.
You are ready to get a set of doubles and need a durable, high flow, convertible, isolation manifold. The new Sonar Premium Dual Outlet 300 Bar Manifold with Isolation crossbar is the one you need. Sonar has always been known to make one of the most durable, high flow valves systems on the market and they have proven to do it again with this Isolation Manifold.
The modular barrel design connectors incorporate double O-ring seals known for their robust reliability. The valves come with standard 300-Bar DIN outlets and 3/4" NPS neck thread inlets that fit nearly all modern Australian standard scuba cylinders, like standard aluminium 80s, or LP or HP stell cylinders. The manifold is Nitrox ready up to 40% oxygen, bagged from the factory with EPDM O-rings for immediate use with enriched air equipment.
Precision machined from high quality marine brass, the manifold will give years of service and corrosion free operation.
The two valves have a standard 3/4" NPSM thread to fit most Australian Standard aluminium and steel tanks/cylinders/bottles. WARNING: Please ensure that you are fitting the valves to the correct cylinder. If in doubt please ask.
Sonar 300 Bar Isolation Manifold Features
- Constructed from marine grade brass
- 3/4-14 NPSM standard inlet threads
- Dedicated DIN for DIN Regulators Only
- Nitrox clean from factory, plastic bagged and EPDM O-rings.
- Engineered with high flow characteristics to maximise regulator performance.
- Easy Grip Hand Wheels
Sonar 300 Bar Isolation Manifold Specifications
- 300 bar Isolation Manifold
- Valve Thread: 3/4" - 14 NPSM
- First Stage Accommodation: 300 bar DIN
- Burst Disk Service Pressure: 3500 psi to 4000 psi
- Oxygen Compatible Materials: Yes
- Manifold Centerline Dist: 215 mm (8.5 inch)
- Cylinder OD size: 175 mm to 203 mm (6.9" to 8")
Manifold Oxygen Cleaning:
This valve is Nitrox ready up to 40%.
If you are planning to use this manifold on cylinders with Enriched Air Nitrox (Nitrox) mixes from more than 40% up to 100% oxygen, it's essential for the safety of the twin cylinder user, and the person filling the cylinders, that the manifold be oxygen cleaned and prepared with special O-rings, seats, and grease designed for exposure to pure oxygen. The cylinders should then be banded with the familiar yellow and green Nitrox band/wrap/sticker, and an Oxygen Clean 'In Test' inspection sticker applied. The Scuba Doctor can do all of this for you as an add-on service.
What is the difference between DIN "200 Bar" and DIN "300 Bar" valves?
The Deutsches Institut Für Normung (DIN) is a German standards setting organization similar to our American National Standards Institute (ANSI) and Compressed Gas Association (CGA). DIN 477 is a specification that recommends cylinder valve outlet and connector designs for specific types of gases and pressures based upon safety considerations. These various designs have deliberate incompatibilities to preclude the possibility of errors when handling different types of compressed gases at differing working pressures.
The two valve outlets and connectors of interest for divers are the DIN 477 No. 13 and the DIN 477 No. 56 (formerly No. 50), both designated for use with compressed air. The DIN 477 valve and regulator fittings are most widely used outside the U.S. The regulator first stage DIN connector is a male screw type, and instead of clamping on to the outside of the valve as does the yoke, it screws directly into the female DIN outlet of the valve. The sealing O-ring is held in the end of the regulator connector rather than in the face of the outlet. The DIN 477 system, with it's captured o-ring design, has proven to be very reliable for use with SCUBA.
Outlet/Connector #13 is from DIN 477 part 1 - for cylinders with test pressure ratings up to 300 bar and is commonly referred to in the SCUBA industry by the slang term "200 bar", probably because most cylinders with 300 bar test pressures have working pressures in the 200 bar range.
Outlet/Connector #56 is from DIN 477 part 5 - for cylinders with test pressure ratings up to 450 bar and is commonly referred to in the SCUBA industry by the slang term "300 bar". The two designs are nearly identical, but the #56 valve outlet is deliberately deeper so the shorter #13 connector will not be long enough to seat properly. This is a safety feature to prevent connecting a low pressure device to a high pressure supply.
It's important to understand that the "200 bar" or "300 bar" descriptions are just slang terms that have nothing to do with the pressure ratings of the outlets and connectors themselves!
Tech Tip: Manifold Crossbar Isolator Valves May Not Improve Safety
The use of an isolator valve on the manifold cross-bar of double cylinders is a relatively recent introduction in the sport, but their use is now nearly universal in technical diving performed in Australia. The idea is that the effect of catastrophic containment failure in the gas path on one cylinder (i.e. burst disk or neck o-ring failure) can be 'isolated' from the other cylinder by closing the crossbar valve.
Very early manifold designs did not have isolator valves and used joints that were face style using metal-to-metal or single O-ring seals. Diving in overhead environments might result in a hard impact directly on on the crossbar and the impact could cause a seal failure with rapid gas loss. The introduction of a third valve in the crossbar itself, termed an 'isolator valve', was a deemed an improvement in safety. Eventually it became apparent that the barrel style joint with double O-ring seals was far more reliable and today the early manifold designs with face style seals are no longer considered acceptable equipment for technical diving. With modern barrel style double O-ring manifolds, while catastrophic gas loss failures can happen in theory, they are very uncommon and occur nearly exclusively during or within a few minutes after filling. In-water failures on double O-ring design manifolds are more like mermaids — the stuff of legends but reliable accounts of anybody having seen one are rare indeed.
Most divers don't realise that isolator valves are not benign... there have been several accidents directly attributable to isolator valves. That's because isolator valves are notorious for being closed and not getting checked prior to fill operations or during pre-dive preparations. There is a significant body of accidents associated with blending errors caused by closed isolator valves, particularly as mixed gas diving has become increasingly widespread. We've even seen 'near misses' and aborted dives that resulted from valve shutdown drills in which the isolator valve was inadvertently left closed.
With the introduction of double O-ring seals on modern cross bar designs, the safety case for the isolator seems pretty thin. Our advice: while we don't advocate eliminating the isolator valve, we recommend that you never, ever, close your isolator unless you have an emergency. Even so, we've seen well meaning but ignorant fill station operators, dive masters and other individuals needlessly close the isolator valve when the doubles set was outside of the supervision of the diver. So be ever vigilent and check your isolator valve is open during filling, before gas analysis, and just before you get in the water.