Adapter 1105 is more suitable for double tanks made of cast iron. This one (1115) works better with the large plastics like the ones on my Camaro 89. This one should also work with cast iron so it might be a better choice rather than buying both. Edit: The rubber on these adapters is too hard. I replaced the master with a composite tank and the body was incorrect. As a result, the reservoir is never closed. As others have said with a cast I would not recommend using a C clamp as a support as it could damage the composite reservoir. Contact Motive Customer Service. You have not received an answer. I replaced the hard rubber with thick neoprene. It only held on air, but at around 20psi of fluid pressure it leaked.
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