This is a collection of direct links to our knowledge base of educational content that appears on the Dive Gear Express website mostly in the form of brief blocks of diving related information that are distinct from our product descriptions and administration content. This knowledge is primarily focused on experienced sport and technical SCUBA divers. It may not be useful to those just now learning to dive, and in some cases might even contradict instructor recommendations to entry level divers.

Our popular Tek-Tips are product independent information attached to the bottom of various category and product pages. There is some product related information, such as our opinions on specific product selection or usage, that we list in a separate Product-Tips category. We have a few longer discussions that we list under the Articles category.

The Dive Gear Express YouTube Channel contains a library of our in-house produced information videos. Each video is focused on important facts for a single topic, omitting extraneous promotional content and excessive detail. The videos are fast paced to keep them compact, about one to three minutes in length with pause and rewind controls always available during viewing.


  1. Compressor Lubrication for SCUBA
  2. Compressor Lubricants and Diver Safety
  3. Nitrox and Compressor Lubrication
  4. Orange, Yellow, or White, which is better?
  5. "OMG" Is your QR insurance paid up?
  6. Where do I get replacement batteries?
  7. Marine Grade Stainless Markings Must Be Annealed
  8. Your Hands and Feet Can Be Larger When Diving
  9. The R-22 and R-17 type oxygen sensors in diving
  10. Aluminum vs. Stainless Hardware
  11. Dust caps with DIN-to-Yoke adapters are not best practice
  12. Is My HP Tank 3/4 NPS or 7/8 UNF Neck Threads?
  13. A unified and robust solution for dive logging software
  14. Rigging the SPG on Stage and Sidemount Bottles
  15. How Deep is DEEP and How Cold is COLD?
  16. Open Water Students and Modern Equipment Configurations
  17. Seriously, Do Not Pee On That...
  18. The 411 on Dive Instrument Consoles vs Wrist Mounts
  19. Line Markers
  20. Advice for Flying with SCUBA tanks
  21. Helium Grades for Breathing Gases in Diving
  22. Environmentally Sealing SCUBA Regulators
  23. High Pressure Swivel Spindles aka 'Air Spools'
  24. 'The Skinny' on Snorkels and SCUBA Diving
  25. Single-Tank-Adapters or Assembly Screws Are Often Counterproductive
  26. Rechargeable Battery Chemistry for Dive Lights - Lithium Ion
  27. When is Enough... Enough?
  28. How do you stay warm in a neoprene wetsuit? Take it off.
  29. About Gas Time Remaining (GTR) Calculations
  30. Diving and Blue Pills
  31. Helium Penalty? What Penalty?
  32. Calibrating Oxygen Analyzers for Diving
  33. B├╝hlmann versus VPM Decompression Schedules
  34. Using a Signal Mirror for Rescue
  35. SCUBA Cylinder Neck Threads and Pressures in North America
  36. Handling Emergency Oxygen Kits
  37. How do the grades of compressed oxygen differ?
  38. Lubrication and SCUBA Valve Installation
  39. Do I really need that big NITROX wrap decal on my tank?
  40. Units of Pressure in Diving
  41. Sunscreen and Dive Computers
  42. Metric vs Imperial SCUBA Cylinder Sizes
  43. Servicing SCUBA Hoses
  44. Quick-Disconnect Compatibility and Lack Thereof
  45. How to use a twist-on handheld dive light or strobe
  46. Damaged 300 bar DIN valve outlets
  47. Can Nitrox or Trimix be run through a breathing air compressor?
  48. A Battery Warning Means You Are Diving On Borrowed Time!
  49. A Common Mistake When Using Tables for Repetitive Dives
  50. About the U.S. Diver Down Flag
  51. Learning From Analysis of Rebreather Deaths
  52. Are Rebreathers Safe?
  53. Using the metal grommets......
  54. Backup Second Stages
  55. Bailout/Deco Regulators
  56. Selection, Care and Maintenance for Guideline Reels
  57. Bad BCD Maintenance = Provoking Instead of Preventing
  58. Beware of Fin Hyperbole
  59. Buddies and BC Integrated Regs
  60. Care and Feeding of Lithium Chemistry Rechargeable Batteries
  61. Choosing Stage/Deco Regulators
  62. Choosing the Best Inflation Hose Length
  63. Choosing the Best Primary SPG Hose Length
  64. Cleaning Low Current Electrical Contacts
  65. Common Uses for Stainless Steel Snaps
  66. Compass Balance Zones
  67. Tiny Bubbles?
  68. Just Say No to Deep Air
  69. Do You Know Your Right From Your Left?
  70. Does the Vindicator knob make sense for experienced divers?
  71. DPV Battery Technology Tradeoffs
  72. Open-Circuit Etiquette with Closed-Circuit Divers
  73. Evolution of Manifolds and Bands
  74. Finger Spools Are Not Guideline Reels
  75. Form vs. Function in Dive Masks
  76. Full Face Masks and Recreational Scuba
  77. A Gas Booster Reality Check
  78. Gearing Up With a Long Hose
  79. Get the Lead Out!
  80. Give Tank Boots the Boot, Decals Too!
  81. Gradient Factors
  82. Helmets Have Their Place In Diving
  83. History of the Finger Spool
  84. Hose Protectors Don't
  85. How Long is Your Hose?
  86. How Much and Where to Use Lubricant
  87. How to Choose Between Lift Bags and Marking Tubes
  88. How to Glue On Your Glue-On Pocket
  89. How to Overhaul a Power Inflator
  90. Independent Twins Are Not Doubles
  91. Inside Submersible Pressure Gauges
  92. Installing Valves in SCUBA Cylinders
  93. Interchangeability of Backplates and Wings
  94. Regulator Intermediate Pressure (IP)
  95. Tang? Pommel? Drop Point? Swage? Spine?
  96. Leaking Mask? Loosen The Strap!
  97. Looping Hoses Under Hose Retainers
  98. Lumens, Lux and Burn Time - Caveat Emptor
  99. Mask Defoggers Explained
  100. Candela vs Lumen
  101. Mixing Brands or Ages of Oxygen Sensors
  102. Mr. Cleaning Your Dive Slate and Wetnotes
  103. Dispelling the Myth of the Simple Oxygen Flush Test
  104. Nitrox? Heliox? Helitrox? Triox? Normoxic Trimix? Hypoxic Trimix? Heliair?
  105. Blame Normalization of Deviance, Not "Complacency"
  106. OOPS.... NOT!
  107. Ordering Vision Correcting Lenses for Dive Masks
  108. The Origin of Hogarthian Configuration
  109. Oxygen Sensor Life in Rebreathers
  110. The Oxygen Shutoff Is a Mixed-Bag
  111. Perfect Positioning of Decals
  112. Piston vs Diaphragm... Does it really matter?
  113. Burst Disks in SCUBA Valves Are Not What You Think
  114. Rebreather Training
  115. Hogarthian Regulator Configuration for Doubles
  116. Long Hose Regulator Configuration for Single Tank Diving
  117. Streamlined Open Water Regulator Configuration
  118. Regulator Necklaces
  119. Sanitizers, Disinfectants, Antiseptics and Your Rebreather
  120. Self-Operated vs Pilot-Operated
  121. Sidemount Diving Has Gone Mainstream
  122. "Sidemount diving makes technical diving easy" - Jeff Loflin
  123. Sidemount Configurations
  124. Valves for Sidemount
  125. Single Tank Mounting with Backplates
  126. Who's Your Buddy... Han?
  127. SPG Floods
  128. Stage Straps
  129. Swivel vs Fixed
  130. Take Only What You Need, No More and No Less
  131. The Best Things in Life are FREE
  132. Threading a 3-Slot Quick-Release Belt Buckle
  133. Time to Fly? Maybe Not.
  134. Types of Back Inflation BC Systems
  135. Do You Sidemount Up or Down?
  136. Upstream vs Downstream
  137. ZHL, VPM, RGBM, DSAT, DCIEM, DCAP ... Does It Really Matter?
  138. What about "black face" instruments?
  139. What Color is Your Parachute Bag?
  140. What Happened to Low-Pressure (LP) Cylinders?
  141. What Happened to My Gas?
  142. What if you donate your primary?
  143. What is the difference between "200 Bar" and "300 Bar" fittings?
  144. What Size Fins Do I Need?
  145. Which Wing Do I Need?
  146. Why Black Dive Masks Are Better
  147. Will back inflation float an unconscious diver face up?
  148. You Can't Get Everything On-Line
  149. Inspect Your Regulator Mouthpiece
  150. BCD Bladder Repairs
  151. Choosing the Best Regulator Hose Length
  152. SCUBA Regulators and Hoses Nomenclature
  153. Sizing and Selecting O-Rings for SCUBA
  154. Canister vs Handheld Lights
  155. Optical Coating Masks Are Not "Cool"
  156. Manifold Crossbar Isolator Valves May Not Improve Safety
  157. StainLESS does not mean StainPROOF
  158. Plan Your Dive - Dive Your Plan
  159. Uncoupling DIN Fittings From SCUBA Valves


  1. How to resurrect a completely dead Poseidon Smart Module
  2. Why Choose XR by Mares?
  3. DGX No Longer Sells SAFT Lithium Batteries
  4. Peregrine vs Perdix AI
  5. DGX Gears brand D6 and XTRA regulators
  6. Backplates and Your Height
  7. Drive Gas Options for the Haskel Mini Sport Booster
  8. Differences of Petrel vs Perdix Dive Computers
  9. Basketball Shoes for Diving... Seriously?
  10. Alternative hose configuration for your Poseidon DSV/ADV/BOV
  11. Maintaining Poseidon Cable Connectors
  12. How are the DGX Premium O2 Valves different from regular SCUBA valves?
  13. Why Choose DIVESOFT?
  14. The NERD 2 from Shearwater Research
  15. What Micro SD-card should I use with Paralenz camera?
  16. About Our Hi-Viz Dacron Line
  17. Garmin Descent Mk2/Mk2i/Mk2s Model Differences
  18. SPG Depth Ratings
  19. Differences of Teric vs Perdix Dive Computers
  20. Why we are ashamed to sell these...
  21. Updating Your Poseidon M28/Se7en/CPOD Firmware
  22. SCUBA Regulator DIN Connector O-ring Sizes
  23. CO2 Absorbent: 797 vs 812 vs 1025
  24. DGX Custom Regulators - Have It Your Way
  25. Nomad XT/LTZ/LT/LS Tank Mount Configuration Options
  26. Recreational Nitrox Configuration of Shearwater Perdix
  27. Advice regarding travel with Sofnolime
  28. Why Choose Dive Rite?
  29. Why Choose G-Dive?
  30. TransPac, TransPlate, and Hydro Lite Sizing
  31. Dive Rite's Gusset Control System
  32. Replacing Air Cell Inflation Assembly Elbows
  33. Why Choose Ocean Management Systems?
  34. Why Choose DGX Gears™ Brand Products?
  35. Why Choose Shearwater Research Dive Computers?
  36. Why dive Poseidon?
  37. Dive Rite Dual Armored Wing Options
  38. Dive Rite Air Cells Overview
  39. Aluminum Cylinders at Dive Gear Express
  40. Steel High Pressure Cylinders by Faber
  41. Steel Specialty Cylinders by Faber
  42. Light Mount Sizing Chart
  43. Compare the DGX 300 - 600 - 800 lights
  44. Why choose Omni-Swivel International products?
  45. Why Choose Analytical Industries?


  1. CCR FAQ - rEvo
  2. How to Select a SCUBA Tank
  3. Calculating SCUBA Cylinder Capacity
  4. Z Factors for SCUBA
  5. How to Attach a Snap
  6. Assembling Double Cylinders
  7. Understanding Nitrox Ready and Oxygen Service
  8. DGX Gears Harness Assembly Instructions
  9. Oxygen Sensor Handling
  10. CCR FAQ - O2ptima
  11. CCR FAQ - Poseidon Se7en+
  12. SCUBA Valves
  13. Sofnolime Absorbent Selection And Handling
  14. Lift Bags versus Marking Tubes
  15. O2ptima Scrubber Duration Test Results
  16. South East Florida Diving Logistics
  17. Suggestions for Selecting a Wing
  18. What is a Rebreather?
  19. About Oxygen Disclaimers