Sentry’s A-4 adapter is one of the more versatile designs for a seal bore tubing head adapter. It can contain more features than any other design. It allows for elastomeric, metal to metal or a combination of the two seal types to be employed. It can have non-continuous or continuous control lines, in multiple quantities if needed. And these control line, injection or other type ports can be the lockdown screw type, flanged or customized to meet your needs.
