Console/gauge hoses: male end; Underneath filter; Hose adapters; HP seat seal; LP swivel cap; HP port plugs, Scubapro 1,050,145, Mares 46110108, 46110110, Apeks: AP1445 High-viscosity silicone oil: High viscosity silicone oil is an ideal all-purpose o-ring lubricant. It is an incredibly efficient seal lubricant and can be utilized in temperatures between -54 𐩑C - 204 𐩑C (-65 𐩑F - 400 𐩑F). General-purpose grease lubricants: General-purpose grease lubricant is excellent for o-ring and elastomer seal varieties used in hydrocarbon service. General-purpose grease lubricant has a recommended service temperature of -29 𐩑C - 82 𐩑C (-20 𐩑F - 180 𐩑F).

Note: As a rule of thumb, the smallest dimension in the specification will be the o-ring cross-section, the largest dimension will be its outer diameter, and the intermediate value is its inner diameter. Lubrication The application parameters should be considered when choosing the appropriate lubricant. The lubricant chosen must be: Some people also incorrectly believe a FPM/FKM/Viton® O-ring can be distinguished from a Nitrile O-ring by the surface appearance. Nitrile O-rings are said to have a shiny surface, and FPM/FKM/Viton® O-rings are said to have a matte surface. This is not a reliable indicator, and certainly not true if the O-ring has been lubricated. How to Replace Your Cylinder/Tank Valve O-ring

Why can’t I use a metal O-ring pick?

Figure 6: Rubber indicator test: Weight (A) and o-ring (B), Ethylene Propylene (E), Nitrile (N), Kalrez (K), and Viton (V) Use a seal material guide Choosing the correct o-ring material for a replacement requires consideration of various factors, including the application's operating conditions and the material compatibility with the fluid being used. Several methods are available to identify the material if it has not been initially discovered. Use a rubber indicator test Extraction and Insertion damage is reduced. Using metal objects to remove O Rings can cause damage to the housing and equipment which then create a leak path that affects the integrity of the seal

Most O-rings used in SCUBA are made from Nitrile, a hydrocarbon based synthetic rubber. Nitrile offers excellent resistance to many oils and acids and has good physical properties. However, Nitrile is not a very oxygen resistant material and is not considered oxygen compatible. Nitrile is also often referred to as Buna-N. Some people believe there is a difference in quality based on colour, but that is more likely attributed to unknowingly using soft dynamic O-rings in static applications. Our O-ring manufacturer states there is little difference in quality for O-rings based on colour alone, and independent testing supports that statement. The groove in the Cressi and Poseidon brand regulator DIN connectors measures closest to the original standard, best accepting a BS ISO 3601 metric size O-ring with 11.3 X 2.4 dimensions for which there is no imperial standard equivalent. The M2.4X11.3 size O-ring is uncommon, especially in a material suitable for use with Nitrox. (FYI, the O-ring in Yoke K-valves is easy, it is always an 014 size.) Clean the o-ring and groove: The groove where the o-ring is installed must be clean and free from any dirt, debris, or previous sealant residue. Also, ensure the o-ring is clean and free from debris or damage. Use a clean, lint-free cloth to wipe the groove clean. Common seal in regulator balance chambers; Power inflator stems; CO2 detonators; SAS gland seal. Sherwood 5121-101,6500-118, Scubpro 1.050.117, Mares 46110101, Apeks ID: AP1299

Scuba O-Ring Application Guide

O-rings made of FPM/FKM/Viton® have been the preferred choice for oxygen and nitrox compatibility in SCUBA diving applications. FPM/FKM/Viton® is an elastomer with excellent oil and oxygen resistance at high and low temperatures, very good chemical resistance. Even for use with ordinary air, most experts agree that FPM/FKM/Viton® O-rings outperform common Nitrile O-rings. To get the greatest product, you need to pay attention to the quality of the things you are purchasing. EPDM O-rings are becoming more common in SCUBA because some people feel it's a safer material for use in breathing air systems. EPDM is a elastomer with excellent weatherability, heat resistance, dielectric qualities and odor-free characteristics. However, EPDM is less resilient and is not recommended for use with petroleum derivatives. An O-ring is a doughnut, or torus shaped seal typically used to prevent the passing of air or fluid. In other words, O-rings are used to keep fluid or air IN or OUT of a defined space. For example, an underwater camera housing uses O-rings to keep water out, and scuba regulators use O-rings to prevent precious air from escaping. Anyone who has to regularly remove and fit O rings on hydraulic, pneumatic or other equipment will know that it can be a fiddly task. The job is made much easier if you have the right tools on hand.