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There are three different materials.
EPDM - Colour is Black
Unless otherwise specified, S-Flex couplings are supplied with EDPM
flexible sleeves. EDPM has good resistance to commonly used
chemicals and is generally not affected by dirt or moisture
Neoprene - Colour is Black with a Green dot
Neoprene provides very good performance characteristics for most
applications and offers a very good resistance to chemical and oil
conditions
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