This is a set of 4 Dubro Fuel Line Plugs (2 small, 2 large).
These are also known as fuel dots.

Features

The plastic plug has a ball that extends 1/4" into the fuel line
for a positive seal.

Includes

Two small fuel line plugs
Two large fuel line plugs

Requires

Installing into the end of a fuel line

Comments

The small size fits 1/16" (1.5mm) and 3/32" (2.3mm) size tubing and
the large size fits 1/8" (3mm) and 5/32" (4mm) size tubing.