PartsmasterPro 57002 Large Rubber O-Ring Set #3 (6-Piece) Installation Guide

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O-Rings
Installation Instructions
An elastomeric O-ring is a doughnut-shaped ring used primarily for sealing
against the loss of fluid. Over time, these seals may wear out and require
replacement. For proper replacement, accurate sizing is critical. O-ring
measurements are metric.
Measuring an 0-ring
Place the O-ring on a clean, flat, and level surface. Do not pinch or stretch the
O-ring but allow it to relax to as perfectly circular as possible. Determine the
Inside Diameter (ID), using a ruler to measure from one inner edge to the
opposite. To measure the Outside Diameter (OD), use a ruler to measure from
one outer edge of the O-ring to the other. Measuring cross section requires a
Vernier caliper, or micrometer. Lightly clamp the jaws of the caliper or
micrometer onto the O-ring, but do not compress it. Alternatively, calculate the
cross section using Cross Section = (OD-ID) — 2
Installing an O-ring
An O-ring may be easily damaged by improper handling and may fail for this
reason alone. Prior to O-ring installation, make sure all glandular surfaces (the
gland is the grooved area where the O-ring will rest when installed) are free of
all debris. Take care not to use solvents as they can damage the O-ring and
present health hazards in faucet applications. Likewise, lubrication is best
performed with water or a silicone faucet grease.
Avoid stretching the O-ring more than 100% during installation (stretch should
not exceed 5% in the application). Also, be sure to stretch it uniformly. Once the
O-ring has been installed, make sure to remove any twists.
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