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

Message Icon