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.


  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 type oxygen sensor in diving
  10. Aluminum vs. Stainless Hardware
  11. Rechargeable Battery Chemistry for Dive Lights - Lithium Ion
  12. When is Enough... Enough?
  13. How do you stay warm in a neoprene wetsuit? Take it off.
  14. About Gas Time Remaining (GTR) Calculations
  15. Diving and Blue Pills
  16. Helium Penalty? What Penalty?
  17. Calibrating Oxygen Analyzers for Diving
  18. Bühlmann versus VPM Decompression Schedules
  19. Using a Signal Mirror for Rescue
  20. SCUBA Cylinder Neck Threads in North America
  21. Handling Emergency Oxygen Kits
  22. How do the grades of compressed oxygen differ?
  23. Lubrication and SCUBA Valve Installation
  24. Do I really need that big NITROX wrap decal on my tank?
  25. Units of Pressure in Diving
  26. Sunscreen and Dive Computers
  27. Metric vs Imperial SCUBA Cylinder Sizes
  28. Servicing SCUBA Hoses
  29. Quick-Disconnect Compatibility and Lack Thereof
  30. How to use a twist-on handheld dive light or strobe
  31. Damaged 300 bar DIN valve outlets
  32. Can Nitrox or Trimix be run through a breathing air compressor?
  33. A Battery Warning Means You Are Diving On Borrowed Time!
  34. A Common Mistake When Using Tables for Repetitive Dives
  35. A Different Method to Remove A Wetsuit
  36. About the U.S. Diver Down Flag
  37. Advice for Traveling with Rebreather Cylinders
  38. Learning From Analysis of Rebreather Deaths
  39. Are Rebreathers Safe?
  40. Using the metal grommets......
  41. Backup Second Stages
  42. Bailout/Deco Regulators
  43. Basic Care and Maintenance for Your Guideline Reel
  44. Bad BCD Maintenance = Provoking Instead of Preventing
  45. Beware of Fin Hyperbole
  46. Buddies and BC Integrated Regs
  47. Care and Feeding of Lithium Chemistry Rechargable Batteries
  48. Choosing Stage/Deco Regulators
  49. Choosing the Best BC Power-Inflator Hose Length
  50. Choosing the Best Primary SPG Hose Length
  51. Cleaning Low Current Electrical Contacts
  52. Common Uses for Stainless Steel Snaps
  53. Compass Balance Zones
  54. Tiny Bubbles?
  55. Just Say No to Deep Air
  56. Do You Know Your Right From Your Left?
  57. Does the Vindicator knob make sense for experienced divers?
  58. DPV Battery Technology Tradeoffs
  59. Etiquette and Rebreather Divers
  60. Evolution of Manifolds and Bands
  61. Finger Spools Are Not Guideline Reels
  62. Form vs. Function in Dive Masks
  63. Full Face Masks and Recreational Scuba
  64. A Gas Booster Reality Check
  65. Gearing Up With a Long Hose
  66. Get the Lead Out!
  67. Give Tank Boots the Boot, Decals Too!
  68. Gradient Factors
  69. Helmets Have Their Place In Diving
  70. History of the Finger Spool
  71. Hose Protectors Don't
  72. How Long is Your Hose?
  73. How Much and Where to Use Lubricant
  74. How to Choose Between Lift Bags and Marking Tubes
  75. How to Glue On Your Glue-On Pocket
  76. How to Overhaul a Power Inflator
  77. Independent Twins Are Not Doubles
  78. Inside Submersible Pressure Gauges
  79. Installing Valves in SCUBA Cylinders
  80. Interchangability of Backplates and Wings
  81. Regulator Intermediate Pressure (IP)
  82. Tang? Pommel? Drop Point? Swage? Spine?
  83. Leaking Mask? Loosen The Strap!
  84. Origin of the Line Arrow
  85. Looping Hoses Under Hose Retainers
  86. Lumens, Lux and Burn Time - Caveat Emptor
  87. Mask Defoggers Explained
  88. Candela vs Lumen
  89. Mixing Brands or Ages of Oxygen Sensors
  90. Mr. Cleaning Your Dive Slate and Wetnotes
  91. Dispelling the Myth of the Simple Oxygen Flush Test
  92. Nitrox? Heliox? Helitrox? Triox? Normoxic Trimix? Hypoxic Trimix? Heliair?
  93. Blame Normalization of Deviance, Not "Complacency"
  94. OOPS.... NOT!
  95. Ordering Vision Correcting Lenses for Dive Masks
  96. The Origin of Hogarthian Configuration
  97. Oxygen Sensor Life in Rebreathers
  98. The Oxygen Solenoid Shut-off Is a Mixed-Bag
  99. Perfect Positioning of Decals
  100. Piston vs Diaphragm... Does it really matter?
  101. Pressure Release Devices aka Burst Disk
  102. Rebreather Training
  103. Hogarthian Regulator Configuration for Doubles
  104. Long Hose Regulator Configuration for Single Tank Diving
  105. Streamlined Open Water Regulator Configuration
  106. Regulator Necklaces
  107. Sanitizers, Disinfectants, Antiseptics and Your Rebreather
  108. Self-Operated vs Pilot-Operated
  109. Sidemount Diving Has Gone Mainstream
  110. "Sidemount diving makes technical diving easy" - Jeff Loflin
  111. Sidemount Configurations
  112. Valves for Sidemount
  113. Single Tank Mounting with Backplates
  114. Who's Your Buddy... Han?
  115. SPG Floods
  116. Stage Straps
  117. Swivel vs Fixed
  118. Take Only What You Need, No More and No Less
  119. The Best Things in Life are FREE
  120. Threading a 3-slot Quick-Release Belt Buckle
  121. Time to Fly? Maybe Not.
  122. Types of Back Inflation BC Systems
  123. Do You Sidemount Up or Down?
  124. Upstream vs Downstream
  125. ZHL-16C, VPM-B, DCAP, DCIEM, VVAL-18M ... Does It Really Matter?
  126. What about "black face" instruments?
  127. What Color is Your Parachute Bag?
  128. What Happened to Low-Pressure (LP) Cylinders?
  129. What Happened to My Gas?
  130. What if you donate your primary?
  131. What is the difference between "200 Bar" and "300 Bar" fittings?
  132. What Size Fins Do I Need?
  133. Which Wing Do I Need?
  134. Why Black Dive Masks Are Better
  135. Will back inflation float an unconscious diver face up?
  136. You Can't Get Everything On-Line
  137. Inspect Your Regulator Mouthpiece
  138. Will it work with my BCD?
  139. Choosing the Best Regulator Hose Length
  140. SCUBA Regulators and Hoses Nomenclature
  141. Sizing and Selecting O-Rings for SCUBA
  142. Submerge Scooter Comparison Chart
  143. Canister vs Handheld Lights
  144. Optical Coating Masks Are Not "Cool"
  145. Manifold Crossbar Isolator Valves May Not Improve Safety
  146. StainLESS does not mean StainPROOF
  147. Plan Your Dive - Dive Your Plan
  148. 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. Oxygen Sensor Availability During Global Pandemic
  5. Differences of Petrel vs Perdix Dive Computers
  6. Basketball Shoes for Diving... Seriously?
  7. Alternative hose configuration for your Poseidon DSV/ADV/BOV
  8. Nautilus Lifeline Radios: Rescue GPS vs Safety VHF models
  9. Maintaining Poseidon Cable Connectors
  10. What are the differences between the Deep Six DGX and Deep Six Signature regulators?
  11. How are the DGX Premium O2 Valves different from regular SCUBA valves?
  12. Why Choose DIVESOFT?
  13. The NERD 2 from Shearwater Research
  14. What Micro SD-card should I use with Paralenz camera?
  15. About Our Hi-Viz Dacron Line
  16. Garmin Descent Mk1 Features Matrix
  17. SPG Depth Ratings
  18. Differences of Teric vs Perdix Dive Computers
  19. Why we are ashamed to sell these...
  20. Updating Your Poseidon M28/Se7en/CPOD Firmware
  21. SCUBA Regulator DIN Connector O-ring Sizes
  22. CO2 Absorbent: 797 vs 812 vs 1025
  23. DGX Custom Regulators - Have It Your Way
  24. Nomad XT/LTZ/LT/LS Tank Mount Configuration Options
  25. Recreational Nitrox Configuration of Shearwater Perdix
  26. Advice regarding travel with Sofnolime
  27. Why Choose Dive Rite?
  28. Why Choose G-Dive?
  29. TransPac, TransPlate, and Hydro Lite Sizing
  30. Dive Rite's Gusset Control System
  31. Replacing Air Cell Inflation Assembly Elbows
  32. Why Choose Ocean Management Systems?
  33. Why Choose DGX Gears™ Brand Products?
  34. Why Choose Shearwater Research Dive Computers?
  35. Why dive Poseidon?
  36. Dive Rite Dual Armored Wing Options
  37. Dive Rite Air Cells Overview
  38. Aluminum Cylinders at Dive Gear Express
  39. Steel High Pressure Cylinders by Faber
  40. Steel Specialty Cylinders by Faber
  41. Why Choose Light Monkey?
  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. Hogarthian 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

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