Accessories and Upgrades


The Bailout Valve (BOV) mouthpiece is an essential part to both the Classic Explorer and Spirit model rebreathers.

CCR diving has its risks. One of the more significant concerns to CCR divers are cases when the rebreather itself malfunctions making it dangerous to breathe off, and the need to bailout to open circuit is paramount.

The BOV does just that allowing the diver to close the Dive Surface Valve (DSV) in the mouthpiece sealing off the loop while simultaneously activating the built-in 2nd stage regulator delivering an alternative gas source the diver can breathe.

Through a single action of turning a knob (Golem Shrimp BOV) or pulling down a lever (Hollis BOV) on the front of the mouthpiece, the diver is thereby able to instantaneity close the loop while at the same time open the connection to the 2nd stage regulator in time to catch the next breath.

During such an emergency, being able to respond easily and swiftly can prevent a situation from getting out of control leading to panic. 

Currently all KISS Rebreathers from the Classic Explorer to the Spirit are offered with the same BOV designed for both Hollis’ Prism II and new Explorer SCR. As BOV’s go, the Hollis has got to be one the most compact models out there. The built in second stage regulator barely protrudes below the dive surface valve of the primary mouthpiece.

Should the Hollis BOV not meet your standards, KISS also offers another option, the Golem Shrimp BOV, with your rebreather. To many Technical CCR divers, the Golem Gear Shrimp BOV is regarded as the Rolls-Royce of BOV’s for its highly robust build and excellent WOB in a compact design.

While the Spirit has no preferential side the LP hose needs to come around to meet the BOV, the preferred side for use on the Classic Explorer is best suited on the right. 

NOTE: * The diluent bottle is not adequate bailout. When diving a rebreather, a separate bailout bottle should always be carried. This same alternative life supporting gas source (depending on your hose routing) may be connected to your BOV to further simplify your means to bail out, should it arise.

K-22D Oxygen Cells

CE Approved, our K-22D oxygen sensors are currently the best, most reliable oxygen reading cells on the market that are fit for use in rebreathers.

Manufactured by Vandagraph Sensor Technologies to the highest specification for exclusive use in our rebreathers, the K-22D features gold plated Molex connections.

If you need to question their proven reliability (resistant to becoming current limited) and quick response time, look to several other leading rebreather manufactures (rEvo, Megladon, Hammerhead, as well as supplier Narked @ 90), for they too call the Vandagraph the “official oxygen cell” for their own products. 

The K-22D works with all models of rebreathers offered by KISS, as well as other rebreathers designed to use R 22D type cells with Molex connections.


New - Syntactic Foam Lining 

Add greater insulation qualities to your KISS Classic or Spirit rebreather’s scrubbers through the placement of a specially applied layer of Syntactic foam to the outside surface of the rebreather's scrubber.

Syntactic foam is a composite material synthesized by filling a metal, polymer, or ceramic matrix with hollow particles called microballoons. These microballoons, also referred to as hollow phenolic microspheres, are then bonded to a matrix of phenolic, epoxy, or polyester, thereby resulting in material with a very low density to high specific strength ratio making it extremely resistant to compression at depth. In addition to being used in buoyancy modules on highly specialized deep diving vehicles like ROV’s (Remotely Operated underwater Vehicles) and AUV’s (Autonomous Underwater Vehicles, used for deep-sea exploration at depths to 20,000 meters, Syntactic foam also provides interesting thermal insulation qualities. 

Appearance wise, Syntactic foam looks a lot like very normal, albeit very high-dense foam. To the touch, the material is in-creditably hard and stiff, but for a diver surrounded by water temps between 61°F/16°C to 32°F/0°C, a 3mm layer to outer surface of the scrubber tubes (finished with a rhino guard coating on top) will provide a 30% increase in insulation to for the scrubbers. If you are a cold-water diver, better heat retention equals better scrubber efficiency and duration.

The Syntactic foam insulation is available as an option is available to KISS Spirit and Classic Explorer model rebreathers for an addition charge of $350 retail at the time of order.

This application can also be rendered to your existing Orca Spirits with the clear scrubber tubes, as well as Classic, provided the scrubber tube is uncoated for the same price, plus shipping.



KISS Off-Board Accessory Kit

First introduced as an add on accessory for KISS Classic Explorer and Sport KISS owners, the Off-board Accessory Kit allows divers to plumb their off-board gas into the Classic Explorer’s diluent gas manifold block.

Doing so, the low pressure hose provides a simple, streamline system for augmenting the diluent supply with their back-up/bailout gas should the diluent supply be depleted or the diver finds themselves in a bail-out situation.

The Off-board kit comes in to two parts:

  • The Rebreather Side Kit is comprised of a 30-inch LP hose with a special Omni-swivel inline shut off valve joined to a check valve with male quick-disconnect fitting at one end, and a LP elbow swivel on the other.
  • The Off-board Cylinder Kit consists of a 6-inch LP hose with a female quick-disconnect fitting on one end with a LP elbow swivel on the other.  

The Off-board Accessory is available in 3 Kits:

  • Rebreather Side Kit
  • Off-board Cylinder Kit
  • Complete Rebreather side/Off-board Kit


GAV: Gas Addition Valve

Although the GAV’s out ward appearances is identical to the KISS MAV, where the GAV differs is that it lacks the orifice that would make it function as a constant mass flow valve. Instead, the only way gas is allowed to pass through the valve is when the diver’s finger presses the actuation button opening the valve for the duration the button is held down. The most common application the GAV is used for is to provide a rapid means of delivering diluent should the diver need to flush the loop. The GAV can also be plumbed to a second onboard oxygen supply as a backup/alternative manual add system. 


KISS MAV & Oxygen Hose Assembly Upgrade Kit

Should you have one the earlier model Classic KISS or Sport KISS with the MAV’s fitted with the stiff steal braided hoses, you can step up to the times with the newer model MAV’s and oxygen compatible LP hose system.

Tested and certified for air, air mix, nitrox to 100% oxygen, the braided hoses that come with MAV kit are extremely flexible and utilize standard scuba fittings. Furthermore, they now come in dark green to identify that this is an oxygen system.

Update packages are available to all Classic & Sport KISS owners. 

Aluminum 14 cu.ft. Spirit Oxygen Cylinder

Manufactured special by Catalina Cylinders for KISS Rebreathers, the aluminum 14 cu.ft. cylinder is standard on the Orca Spirit, and can make a great complement to the Spirit LTE. In addition to providing one more cubic foot of oxygen over a standard 13 cu.ft cylinder, the 14’s shorter 10.5-inch length will certainly add to the rebreather’s streamline profile.


  • Cylinder type: Aluminum
  • Dimensions: 10.5-inches (without valve) x 5.25-inches in diameter.
  • Capacity: 14 cu.ft at 3000 PSI
  • Weight: 9 lbs. with DIN Valve




Spirit LTE Stainless Steel Back Plate

Made from marine grade stainless, the Spirit LTE Stainless Steel back plate features the same height, width and shape of the ABS back plate currently supplied with the KISS Spirit LTE.

The purpose of this alternative back plate is two fold. First is providing greater rigidity for side mounting large cylinders and accessories. The second is the 1/8” thick steel back plate ups the unit’s overall weight by 6.3 lbs. / 2.9 kgs, making the unit more suitable for divers needing addition weight for colder water diving when weight is essential with thicker wetsuits and dry suits.

The back plate prefabricated with all to the same holes to allow easy migration of all the mounting hardware on the Spirit LTE for the two scrubbers, oxygen cylinder and gas block to the steel back plate.

Dimensions: 18” H x 11-3/8” W x 1/8” T – 45.7 cm x 28.9 cm x .6 cm

Weight: 6.3 lbs. / 2.9 kgs

Contact your local KISS Rebreathers dealer pricing. 


Shearwater Petrel

The Shearwater Petrel is a robust dive computer for technical divers of all levels. Ready out of the box for air, nitrox, and trimix gasses, the Petrel-EXT can be used for open-circuit and closed-circuit diving, as well as gauge mode if desired - no pin upgrades are needed.

For both monitoring PO2 and managing your dive profiles on a CCR, there is no computer better match for KISS Rebreathers than the Petrel-EXT.

Petrel-EXT Features:

  • External PO2 monitoring of 3 cells
  • Supports single cell monitoring in Semi-Closed mode
  • Constant PPO2 Set Point
  • Automatic Set Point Switching
  • 5 open-circuit gas switch presets
  • 5 additional CCR Diluent gas presets
  • Air/Nitrox/Trimix capable
  • Bühlmann ZHL-16C with Gradient Factors
  • 2 button push OC bailout
  • Optional Varying Permeability Model (VPM-B)
  • %CNS oxygen exposure tracking
  • Ascent rate monitor
  • Date, time and temp display
  • Easy to read large full color screen
  • Simple to use adaptive menus
  • Water activated and programmable
  • Logbook of last 1000 hours of diving
  • Depth sensor rated to 450 ft / 137 m
  • Battery voltage and warning
  • Metric and Imperial
  • Right or left wrist mountable
  • User changeable battery
  • Battery life: 36 hours of diving with 1.5V Alkaline, up to 90 hours with Saft 3.6V LS14500 battery
  • Bluetooth wireless upload/download
  • User upgradable firmware Dive Log
  • Software compatible with both PC and Mac OS 


KISS Shearwater Petrel PO2 Display

For those on a budget, the Shearwater Petrel PO2 display is much more cost saving alternative to purchasing a new Petrel EXT model computer.

An exclusive offering from KISS Rebreathers, the Petrel PO2 Display is a full functioning wrist mount display providing the diver PO2 information from all three cells, along with depth (including max. and avg.) and time on the same color LCD display used in the Petrel EXT.

This is because the Petrel PO2 display is actually a locked version of that same computer, so that when the time comes, you will be able to purchase the PIN to unlock all of the computer’s functions rendering your display into a full Petrel dive computer.

Like the Petrel EXT, at the time of your Classic Explorer, Spirit or Sidekick rebreather purchase, you can opt to have your Petrel PO2 display hardwired to the wrist unit instead of using a Fischer cable. Furthermore, the PO2 display can be wired jointly with a second PO2 display, Petrel EXT, KISS HUD or Shearwater N.E.R.D. on both Classic Explorer and Spirit model rebreathers.


Shearwater N.E.R.D.

For those who prefer to have their information closer than at their fingertips, Shearwater’s new ground breaking Near Eye Remote Display or NERD delivers all the same information as their wrist mount Petrel right in front of the diver’s eye.  

The computer’s display mounts on your rebreather mouthpiece, so that the diver can maintain a line-of-sight of all crucial numbers the entire duration of the dive, leaving their wrist mounted display to serve as back-up.

Your eye sees the image as if it is displayed on a 32" TV screen 12 feet away without the need to focus. The display is unobtrusive, disappearing when you look straight ahead. There, when you need it, out of your way when you don’t.  

The NERD displays the same information as the Petrel technical diving computer, and features the same rugged design, built to withstand the most extreme diving conditions.  The device also connects to your desktop computer through Bluetooth, enabling you to keep a detailed dive log and easily download firmware upgrades as they become available.

KISS/Shearwater HUD

The basic function of a Heads Up Display (HUD) provides the diver with an alternative means of monitoring their current PPO2 information without having to look at their dive computer or display. In addition to technical diving applications such as cave diving or working in extremely poor visibility, a HUD can be an invaluable tool for Photographers and Videographers that can't take their eyes off a subject during a critical moment of a shoot.

KISS Rebreathers is proud to be able to offer KISS customers the availability of the original Shearwater HUD as an optional secondary display component with all Classic Explorer and Spirit rebreathers. Check out the details and pricing here.