ER-3A insert phone tubing

Here is a picture of a pair of insert phone tubing which needs to be replaced.  This pair of tubing is approximately one year old.  Notice that one end of the tubing (foam insert end) has discolored and stretched more than the other.  The yellowing of the tubing is a result of the oils and other chemicals naturally present in fingers.  When fingers come into contacting with the tubing over a period of time, it begins to break down and wear out.  The opposite end of the tubing does not seem to be yellowing and this is because of it does not come into direct human contact as often.

When replacing the tubing, it is important to pre-stretch the tubing diameter before inserting it over the ER-3A plastic casing.  If pre-stretching is not performed, the tubing may not fit.  Forcing it down onto the casing may cause the plastic tip on the casing to collapse.  

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