This is a quality replacement thermostat applicable to all Fiat and Bertone X1/9s .
Also applicable to early 128 and Yugo cars with 2-piece, serviceable thermostat.
2mm smaller in diameter than the original equipment unit, but will seat and seal properly with the outer rubber O-ring.
We use these in our vehicle service activities and know for certain that they work correctly in this application.
Need gaskets? Use these with this thermostat:
4252971 Housing Elbow gasket (X1/9)
4179183 Housing Elbow gasket (128 / Yugo)
4184495 O-ring seal
New and unused.