232 Buna-N O-Ring, 70A Durometer, Quad, Black, 2-3/4" Id, 3" Od,, Pack Of 10 Product Details This quad-ring is made of black Buna-nitrile (also called Buna-N), has a durometer (hardness) of 70A, and can be used in a wide variety of static and dynamic sealing applications. This Buna-nitrile quad-ring has high tensile strength, and abrasion, tear, and compression set resistance. Buna-nitrile is acceptable for temperature applications between -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C). It is compatible for use with petroleum, HFA, HFB, and HFC fluids, vegetable oil, and other aliphatic hydrocarbons. Buna-nitrile is vulnerable to ozone, sunlight, and weathering and should therefore not be used in ozone-generating electric motors, welding equipment, or in applications with direct exposure to UV light. Buna-nitrile quad-rings have a shore durometer of 70A. Shore durometer is the hardness of a material, and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation on a scale of 0 to 100, with 100 indicating no indentation. Quad-rings, also called X-rings, provide a pressure and fluid seal between overlapping surfaces in static and dynamic sealing applications, and are commonly used in engines, faucets, flanges, valves, and various cylinders. They have a four-lobe design, to provide two contact points, which results in less friction, twisting and leakage. Quad-rings are available in a number of different sizes, and can be ordered based on required nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter. Buna quad-rings meet standards defined by Aerospace Standard AS568A, Aerospace Size Standard for O-rings. Made of Buna-nitrile for use with a variety of fluids and hydrocarbons Four-lobe shape for lower friction and resistance to twisting Can be used across a wide temperature range from -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C) Quad-ring, four-lobe design for increased sealing surface and resistance to leakage Durometer of 70A for resistance to penetration Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.