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The OTS Guardian M9 Inner Clamp Ring (SKU: 873005-000 / OTS-873005-000) is an essential OEM replacement hardware component designed specifically for the Ocean Technology Systems (OTS) Guardian Full Face Mask (FFM).
This rigid internal ring sits inside the main visor housing, securing the perimeter of the silicone face skirt and oral-nasal pocket to the outer mask frame.
It ensures uniform clamping compression across the seal to maintain a 100% airtight and watertight breathing cavity.
The OTS Guardian M9 Inner Clamp Ring (873005-000) is a genuine OEM structural component used within the OTS Guardian Full Face Mask. The Inner Clamp Ring forms part of the mask's internal retention and clamping assembly, helping secure critical components within the mask body and visor interface system. It works in conjunction with the Interior Vent Clamp and Inner Clamp Screw to maintain proper assembly alignment and structural integrity.
As identified in the official Guardian parts schematic, the Inner Clamp Ring is designated as M9 and serves as one of the key retaining components in the front mask assembly.
Product Type: OEM Replacement Inner Clamp Ring / Retention Bezel
Compatibility: Exclusively engineered for the OTS Guardian Full Face Mask frame assembly. (Does not fit Spectrum, Interspiro Divator, or Ocean Reef IDM systems).
Primary Function: Anchors the internal silicone skirt lip against the rigid polycarbonate visor and outer housing, providing structural integrity and preventing water intrusion around the face seal interface.
Function Within the Guardian Mask
The Inner Clamp Ring functions as part of the Guardian's internal clamping system. Its primary purposes include:
The part is integrated into the mask's front section where several components work together to create the Guardian's rugged construction.

| Product Category | Accessories |
| SKU | OTS-873005-000 |
| Stock | 4 |
| Condition | New |
| Brand | Ocean Technology Systems |
| More Info | TECH SPECS: MANUFACTURER - Ocean Technology Systems (OTS) PRODUCT NAME - Quick Connect Casing Guardian Inner Clamp Ring
PART NUMBER = 873005-000 SKU = OTS-873005-000 SCHEMATIC REFERENCE - M9 SYSTEM - Guardian Full Face Mask ASSEMBLY LOCATION - Front mask clamp system FUNCTION - Internal retention & clamp ring APPLICATION - Service and replacement part COMPATIBILITY - OTS Guardian FFM INSTALLATION LOCATION - Front mask clamp system MODEL /SIZING DESIGNATOR = M9 Profile Inner Clamp MATERIAL - High-Impact Delrin / Marine-Grade Glass-Filled Polymer Composite APPLICATION POINT - Internal Mask Frame & Silicone Skirt Retention Interface CORROSION PROTECTION - Fully resistant to saltwater corrosion, pool chemicals, and UV degradation Key Advantages & Operational Role
Tips & Tricks for Installation & Maintenance Perfect Skirt Track Alignment
Alternating Screw Torque
Inspect for Cracks or Stress Fractures
Post-Dive Care & Flushing
Position Within the Guardian Full Face Mask According to the Guardian maintenance schematic, the M9 Inner Clamp Ring is located within the front assembly area of the mask and works directly with the Interior Vent Clamp and Inner Clamp Screw. This assembly helps provide the Guardian's robust construction and dependable operational reliability. About the OTS Guardian Full Face Mask The OTS Guardian Full Face Mask is designed for recreational, military, public safety, and commercial diving applications. Notable features include:
Compatibility The OTS-873005-000 Inner Clamp Ring is designed for:
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