{"product_id":"castair-replacement-2-o-ring-for-inspection-plug-or2","title":"Castair Replacement 2\" O-Ring for Inspection Plug OR2","description":"\u003ch2\u003eCast Air OR2 — 2\" O-Ring for Air Compressor Tank Inspection Plug\u003c\/h2\u003e\n\n\u003cp\u003eThis is the Cast Air OR2, a 2\" O-ring designed specifically for use with the 2\" inspection plug on Cast Air air compressor tanks. If your tank inspection port is leaking — either slowly seeping air at the plug or weeping moisture — this O-ring is almost certainly the cause. It is a wear item. It sees pressure cycling and temperature cycling every time the compressor runs, and over time the rubber hardens, compresses permanently, or develops small tears that prevent a reliable seal. Replacing it is a five-minute job that costs less than five dollars and eliminates the leak entirely.\u003c\/p\u003e\n\n\u003cp\u003eThis O-ring is the correct size and material specification for Cast Air tank inspection plugs. Using an off-the-shelf O-ring from a hardware store is a gamble — the dimensions may be close but not exact, and the rubber compound may not be rated for the pressures and temperatures inside a compressor tank. The OR2 is the right part for the job.\u003c\/p\u003e\n\n\u003ch3\u003eWhat the Inspection Plug and O-Ring Do\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInspection plug (IP2):\u003c\/strong\u003e The 2\" threaded plug that seals a port in the compressor tank. This port allows inspection of the tank interior and drainage of accumulated moisture. It is installed at the factory and rarely removed unless inspection or maintenance is required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eO-ring function:\u003c\/strong\u003e The OR2 O-ring seats between the plug body and the tank port face (or in a groove on the plug itself), providing the primary seal that holds tank pressure. Without a good O-ring, the plug may appear tight but will leak at the sealing surface.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWhen to replace:\u003c\/strong\u003e Any time you remove the inspection plug for tank inspection or moisture draining, replace the O-ring before reinstalling the plug. This is standard practice. O-rings that have been compressed under pressure for extended periods often will not reseal reliably when reinstalled.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdentifying When This O-Ring Has Failed\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVisible leak at inspection plug:\u003c\/strong\u003e Soap test shows bubbles forming around the plug threads or seating face\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompressor cycling more frequently:\u003c\/strong\u003e A slow tank leak causes pressure to drop faster, triggering the pressure switch sooner than it should\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAudible hiss near the plug:\u003c\/strong\u003e A failed O-ring may produce a faint hissing sound when the tank is at operating pressure\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMoisture staining around the plug:\u003c\/strong\u003e Even a minor seep can leave rust staining or moisture streaks on the tank surface near the plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrevious removal of the plug:\u003c\/strong\u003e If the plug has been removed at any point for inspection or cleaning, the O-ring should be replaced as a matter of course before reinstalling\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDepressurize the tank completely\u003c\/strong\u003e before removing the inspection plug. This is not optional.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClean the seating surface\u003c\/strong\u003e on the tank port and the plug body before installing the new O-ring. Any grit, rust, or old rubber residue will prevent the new O-ring from sealing correctly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLubricate lightly\u003c\/strong\u003e with a compatible O-ring lubricant or clean compressor oil before installation. This helps the O-ring seat properly and prevents tearing during installation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDo not overtighten\u003c\/strong\u003e the plug. The O-ring does the sealing work. Overtightening crushes the O-ring beyond its design compression and can damage it immediately.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure test\u003c\/strong\u003e after reinstalling the plug. Run the compressor to operating pressure and soap-test the plug before returning the machine to service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIP2 — 2\" Inspection Plug:\u003c\/strong\u003e The plug itself. If the plug is damaged, corroded, or cross-threaded, replace the whole plug along with the O-ring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOR2 — 2\" O-Ring (this part):\u003c\/strong\u003e The sealing O-ring. Replace whenever the plug is removed or if a seal leak is present.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf your plug is in good condition, you only need the OR2. If the plug has been damaged or the threads are questionable, order the IP2 inspection plug and install a fresh OR2 with it.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e OR2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDescription:\u003c\/strong\u003e 2\" O-Ring for Inspection Plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Cast Air air compressor tank inspection port\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible plug:\u003c\/strong\u003e IP2 (2\" Inspection Plug)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 2\" nominal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $4.62\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe stock Cast Air OEM replacement parts including the OR2 O-ring because getting the right specification matters even on small parts. An O-ring that is 0.05\" too large in cross-section or 1\/8\" off in ID will not seal correctly, and you will be back to troubleshooting a leak that should have been fixed. The OR2 is the correct part for Cast Air inspection plugs — dimensionally accurate and made from the appropriate rubber compound for compressor service.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFree tech support:\u003c\/strong\u003e Call 866-217-0063 if you are not sure whether the OR2 is the right O-ring for your specific Cast Air model\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e on all parts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHonest guidance:\u003c\/strong\u003e We will tell you if you need just the O-ring or the whole inspection plug assembly — not just add both to your cart\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342572806357,"sku":"OR2","price":8.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/360_F_473254957_bxG9yf4ly7OBO5I0O5KABlN930GwaMQz_0bd04d00-2c24-42c6-9375-72c75d9fa3ca.jpg?v=1772652756","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-replacement-2-o-ring-for-inspection-plug-or2","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}