On the SE products (3130SE, 4040SE, 4040SEH) - the solenoid is in the track. The solenoid is part of the SE track assemblies only and not sold separately.
On the ME products (2310ME, 4310ME, 4410ME and the HSA units) - the solenoid is assembled to the end of the cylinder body. The solenoid is part of the cylinder assembly only and not sold separately.
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