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


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


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


© Copyright 2009 to 2019 Dive Gear Express®
Message Icon
Message Icon