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


  1. How to resurrect a completely dead Poseidon battery
  2. Why Choose XR by Mares?
  3. Differences of Petrel vs Perdix Dive Computers
  4. Basketball Shoes for Diving... Seriously?
  5. Alternative hose configuration for your Poseidon DSV/ADV/BOV
  6. Nautilus Lifeline Radios: Rescue GPS vs Safety VHF models
  7. Maintaining Poseidon Cable Connectors
  8. What are the differences between the Deep Six DGX and Deep Six Signature regulators?
  9. How are the DGX Premium O2 Valves different from regular SCUBA valves?
  10. Why Choose DIVESOFT?
  11. The NERD 2 from Shearwater Research
  12. What Micro SD-card should I use with Paralenz camera?
  13. About Our Hi-Viz Dacron Line
  14. Garmin Descent Mk1 Features Matrix
  15. SPG Depth Ratings
  16. Differences of Teric vs Perdix Dive Computers
  17. Why we are ashamed to sell these...
  18. Updating Your Poseidon M28/Se7en/CPOD Firmware
  19. SCUBA Regulator DIN Connector O-ring Sizes
  20. CO2 Absorbent: 797 vs 812 vs 1025
  21. DGX Custom Regulators - Have It Your Way
  22. Nomad XT/LTZ/LT/LS Tank Mount Configuration Options
  23. Recreational Nitrox Configuration of Shearwater Perdix
  24. Advice regarding travel with Sofnolime
  25. Why Choose Dive Rite?
  26. Why Choose G-Dive?
  27. TransPac, TransPlate, and TravelPac Sizing
  28. Dive Rite's Gusset Control System
  29. Replacing Air Cell Inflation Assembly Elbows
  30. Why Choose Ocean Management Systems?
  31. Why Choose DGX Gears™ Brand Products?
  32. Why Choose Shearwater Research Dive Computers?
  33. Why dive Poseidon?
  34. Dive Rite Dual Armored Wing Options
  35. Dive Rite Air Cells Overview
  36. Aluminum Cylinders at Dive Gear Express
  37. Steel High Pressure Cylinders by Faber
  38. Steel Specialty Cylinders by Faber
  39. Why Choose Light Monkey?
  40. Light Mount Sizing Chart
  41. Compare the DGX 300 - 600 - 800 lights
  42. Why choose Omni-Swivel International products?
  43. 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. Rebreather 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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