![What's this? My water heater has a scuba tank attached to it. :) Is it a softener? The main runs through the manifold at the top, but I've never used this. : What's this? My water heater has a scuba tank attached to it. :) Is it a softener? The main runs through the manifold at the top, but I've never used this. :](https://preview.redd.it/qi1q5806e4q51.jpg?auto=webp&s=a40b6f1da5aa6091841757ab60420d5a3c7094f0)
What's this? My water heater has a scuba tank attached to it. :) Is it a softener? The main runs through the manifold at the top, but I've never used this. :
![Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors](https://images-na.ssl-images-amazon.com/images/I/313D76rIxML._AC_UL600_SR600,600_.jpg)
Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors
![Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors](https://images-na.ssl-images-amazon.com/images/W/MEDIAX_792452-T2/images/I/61wQ1eL6hAL._AC_UL600_SR600,600_.jpg)
Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors
![XS Scuba DIN Valve to Yoke Valve Insert For Scuba Tanks: Diving Valves: Amazon.com: Industrial & Scientific XS Scuba DIN Valve to Yoke Valve Insert For Scuba Tanks: Diving Valves: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/51yFrX8aG0L.jpg)
XS Scuba DIN Valve to Yoke Valve Insert For Scuba Tanks: Diving Valves: Amazon.com: Industrial & Scientific
![XS Scuba DIN Valve to Yoke Valve Insert For Scuba Tanks: Diving Valves: Amazon.com: Industrial & Scientific XS Scuba DIN Valve to Yoke Valve Insert For Scuba Tanks: Diving Valves: Amazon.com: Industrial & Scientific](https://images-na.ssl-images-amazon.com/images/W/MEDIAX_792452-T2/images/I/51AMe7mOF-L._AC_UL600_SR600,600_.jpg)
XS Scuba DIN Valve to Yoke Valve Insert For Scuba Tanks: Diving Valves: Amazon.com: Industrial & Scientific
![Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors](https://images-na.ssl-images-amazon.com/images/I/61NG2SEH69L._AC_UL600_SR600,600_.jpg)
Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors
![Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors](https://images-na.ssl-images-amazon.com/images/W/MEDIAX_792452-T2/images/I/41BHrWzw7TL._AC_UL600_SR600,600_.jpg)
Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors
![Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/31Fk1kWf+QL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : Storm Isolation Scuba Tank Manifold - 300BAR : Diving Tank Accessories : Sports & Outdoors
![Amazon.com: Scuba Diving Doubles Manifold Crossbar with Isolation Valve and Fine Threads for Hollis, XS Scuba, Thermo, Diverite, HOG & Sea Elite Modular Valves : Sports & Outdoors Amazon.com: Scuba Diving Doubles Manifold Crossbar with Isolation Valve and Fine Threads for Hollis, XS Scuba, Thermo, Diverite, HOG & Sea Elite Modular Valves : Sports & Outdoors](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/41nVdVRed8L.jpg)