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This Rapid Dose radiator filling adaptor can act as a purpose-designed connector, with a inch BSP filling loop, to simply connect a canister to a filling loop isolation valve and the canister will instantly discharge itself. Features & Benefits: Rapid Dose Radiator Filling Adaptor 612J, inch BSP filling loop, Purpose-designed connector, Simply connects the Rapid Dose canister, Helps to fill a loop isolation valve as the canister instantly discharges. Rapid Dose Radiator Filling Adaptor 612J Sentinel 608180