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. Rechargeable Battery Chemistry for Dive Lights - Lithium Ion
  10. When is Enough... Enough?
  11. How do you stay warm in a neoprene wetsuit? Take it off.
  12. About Gas Time Remaining (GTR) Calculations
  13. Diving and Blue Pills
  14. Helium Penalty? What Penalty?
  15. Calibrating Oxygen Analyzers for Diving
  16. Bühlmann versus VPM Decompression Schedules
  17. Using a Signal Mirror for Rescue
  18. SCUBA Cylinder Neck Threads in North America
  19. Handling Emergency Oxygen Kits
  20. How do the grades of compressed oxygen differ?
  21. Lubrication and SCUBA Valve Installation
  22. Do I really need that big NITROX wrap decal on my tank?
  23. Units of Pressure in Diving
  24. Sunscreen and Dive Computers
  25. Metric vs Imperial SCUBA Cylinder Sizes
  26. Servicing SCUBA Hoses
  27. Quick-Disconnect Compatibility and Lack Thereof
  28. How to use a twist-on handheld dive light or strobe
  29. Damaged 300 bar DIN valve outlets
  30. Can Nitrox or Trimix be run through a breathing air compressor?
  31. A Battery Warning Means You Are Diving On Borrowed Time!
  32. A Common Mistake When Using Tables for Repetitive Dives
  33. A Different Method to Remove A Wetsuit
  34. About the U.S. Diver Down Flag
  35. Advice for Traveling with Rebreather Cylinders
  36. Learning From Analysis of Rebreather Deaths
  37. Are Rebreathers Safe?
  38. Using the metal grommets......
  39. Backup Second Stages
  40. Bailout/Deco Regulators
  41. Basic Care and Maintenance for Your Guideline Reel
  42. Bad BCD Maintenance = Provoking Instead of Preventing
  43. Beware of Fin Hyperbole
  44. Buddies and BC Integrated Regs
  45. Care and Feeding of Lithium Chemistry Rechargable Batteries
  46. Choosing Stage/Deco Regulators
  47. Choosing the Best BC Power-Inflator Hose Length
  48. Choosing the Best Primary SPG Hose Length
  49. Cleaning Low Current Electrical Contacts
  50. Common Uses for Stainless Steel Snaps
  51. Compass Balance Zones
  52. Tiny Bubbles?
  53. Just Say No to Deep Air
  54. Do You Know Your Right From Your Left?
  55. Does the Vindicator knob make sense for experienced divers?
  56. DPV Battery Technology Tradeoffs
  57. Etiquette and Rebreather Divers
  58. Evolution of Manifolds and Bands
  59. Finger Spools Are Not Guideline Reels
  60. Form vs. Function in Dive Masks
  61. Full Face Masks and Recreational Scuba
  62. A Gas Booster Reality Check
  63. Gearing Up With a Long Hose
  64. Get the Lead Out!
  65. Give Tank Boots the Boot, Decals Too!
  66. Gradient Factors
  67. Helmets Have Their Place In Diving
  68. History of the Finger Spool
  69. Hose Protectors Don't
  70. How Long is Your Hose?
  71. How Much and Where to Use Lubricant
  72. How to Choose Between Lift and Marking Bags
  73. How to Glue On Your Glue-On Pocket
  74. How to Overhaul a Power Inflator
  75. Independent Twins Are Not Doubles
  76. Inside Submersible Pressure Gauges
  77. Installing Valves in SCUBA Cylinders
  78. Interchangability of Backplates and Wings
  79. Regulator Intermediate Pressure (IP)
  80. Tang? Pommel? Drop Point? Swage? Spine?
  81. Leaking Mask? Loosen The Strap!
  82. Origin of the Line Arrow
  83. Looping Hoses Under Hose Retainers
  84. Lumens, Lux and Burn Time - Caveat Emptor
  85. Mask Defoggers Explained
  86. Candela vs Lumen
  87. Mixing Brands or Ages of Oxygen Sensors
  88. Mr. Cleaning Your Dive Slate and Wetnotes
  89. Dispelling the Myth of the Simple Oxygen Flush Test
  90. Nitrox? Heliox? Helitrox? Triox? Normoxic Trimix? Hypoxic Trimix? Heliair?
  91. Blame Normalization of Deviance, Not "Complacency"
  92. OOPS.... NOT!
  93. Ordering Vision Correcting Lenses for Dive Masks
  94. The Origin of Hogarthian Configuration
  95. Oxygen Sensor Life in Rebreathers
  96. The Oxygen Solenoid Shut-off Is a Mixed-Bag
  97. Perfect Positioning of Decals
  98. Piston vs Diaphragm... Does it really matter?
  99. Pressure Release Devices aka Burst Disk
  100. Rebreather Training
  101. Hogarthian Regulator Configuration for Doubles
  102. Long Hose Regulator Configuration for Single Tank Diving
  103. Streamlined Open Water Regulator Configuration
  104. Regulator Necklaces
  105. Sanitizers, Disinfectants, Antiseptics and Your Rebreather
  106. Self-Operated vs Pilot-Operated
  107. Sidemount Diving Has Gone Mainstream
  108. "Sidemount diving makes technical diving easy" - Jeff Loflin
  109. Sidemount Configurations
  110. Valves for Sidemount
  111. Single Tank Mounting with Backplates
  112. Who's Your Buddy... Han?
  113. SPG Floods
  114. Stage Straps
  115. Swivel vs Fixed
  116. Take Only What You Need, No More and No Less
  117. The Best Things in Life are FREE
  118. Threading a 3-slot Quick-Release Belt Buckle
  119. Time to Fly? Maybe Not.
  120. Types of Back Inflation BC Systems
  121. Do You Sidemount Up or Down?
  122. Upstream vs Downstream
  123. ZHL-16C, VPM-B, DCAP, DCIEM, VVAL-18M ... Does It Really Matter?
  124. What about "black face" instruments?
  125. What Color is Your Parachute Bag?
  126. What Happened to Low-Pressure (LP) Cylinders?
  127. What Happened to My Gas?
  128. What if you donate your primary?
  129. What is the difference between "200 Bar" and "300 Bar" fittings?
  130. What Size Fins Do I Need?
  131. Which Wing Do I Need?
  132. Why Black Dive Masks Are Better
  133. Will back inflation float an unconscious diver face up?
  134. You Can't Get Everything On-Line
  135. Inspect Your Regulator Mouthpiece
  136. Will it work with my BCD?
  137. Choosing the Best Regulator Hose Length
  138. SCUBA Regulators and Hoses Nomenclature
  139. Sizing and Selecting O-Rings for SCUBA
  140. Submerge Scooter Comparison Chart
  141. Canister vs Handheld Lights
  142. Optical Coating Masks Are Not "Cool"
  143. Manifold Crossbar Isolator Valves May Not Improve Safety
  144. StainLESS does not mean StainPROOF
  145. Plan Your Dive - Dive Your Plan
  146. 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. Differences of Petrel vs Perdix Dive Computers
  5. Basketball Shoes for Diving... Seriously?
  6. Alternative hose configuration for your Poseidon DSV/ADV/BOV
  7. Nautilus Lifeline Radios: Rescue GPS vs Safety VHF models
  8. Maintaining Poseidon Cable Connectors
  9. What are the differences between the Deep Six DGX and Deep Six Signature regulators?
  10. How are the DGX Premium O2 Valves different from regular SCUBA valves?
  11. Why Choose DIVESOFT?
  12. The NERD 2 from Shearwater Research
  13. What Micro SD-card should I use with Paralenz camera?
  14. About Our Hi-Viz Dacron Line
  15. Garmin Descent Mk1 Features Matrix
  16. SPG Depth Ratings
  17. Differences of Teric vs Perdix Dive Computers
  18. Why we are ashamed to sell these...
  19. Updating Your Poseidon M28/Se7en/CPOD Firmware
  20. SCUBA Regulator DIN Connector O-ring Sizes
  21. CO2 Absorbent: 797 vs 812 vs 1025
  22. DGX Custom Regulators - Have It Your Way
  23. Nomad XT/LTZ/LT/LS Tank Mount Configuration Options
  24. Recreational Nitrox Configuration of Shearwater Perdix
  25. Advice regarding travel with Sofnolime
  26. Why Choose Dive Rite?
  27. Why Choose G-Dive?
  28. TransPac, TransPlate, and Hydro Lite Sizing
  29. Dive Rite's Gusset Control System
  30. Replacing Air Cell Inflation Assembly Elbows
  31. Why Choose Ocean Management Systems?
  32. Why Choose DGX Gears™ Brand Products?
  33. Why Choose Shearwater Research Dive Computers?
  34. Why dive Poseidon?
  35. Dive Rite Dual Armored Wing Options
  36. Dive Rite Air Cells Overview
  37. Aluminum Cylinders at Dive Gear Express
  38. Steel High Pressure Cylinders by Faber
  39. Steel Specialty Cylinders by Faber
  40. Why Choose Light Monkey?
  41. Light Mount Sizing Chart
  42. Compare the DGX 300 - 600 - 800 lights
  43. Why choose Omni-Swivel International products?
  44. 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 Bags
  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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