'OR 70 EPDM 335 DW 'O' rings'. Black coloured, injection moulded EPDM 'O' rings. Shore hardness 70. ‘O’ rings with an in-radius size between 0.5mm & 1.77mm are for use with water up to 85°C. When processing an application for WRAS Product Approval the in-radius tolerance may not be applied to these sizes. ‘O’ rings with an in-radius size of 3.5mm were added to the approval in December 2025 and are for use with water up to 23°C. When processing an application for WRAS Product Approval the in-radius tolerance may be applied to these sizes.
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