This is our round bolt on muffler adaptor for the John Deere 320, 330, 420, 430, 440 & 435 tractors.  This adaptor is designed for use with our clamp on mufflers for the same tractors. The adaptor has a 1-7/8" inlet, 2" outlet and is fitted with mounting flange to bolt to the exhaust manifold. This adaptor comes painted black.  You can easily paint this adaptor silver, as many restorers prefer those two colors for this design.