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Assuming the T/Stat by-pass hose is fitted as normal that WILL be the HEATER fitting that has a blanking cap fitted. To avoid this happening on race engines we remove the factory pressed in hose fitting & tap the W.P. housing for a screw in plug. Most of those rubber blanking plugs do not have any braid or weave in their construction to prevent failure when hot, therefore they wont stand as much pressure as a piece of heater hose.
Jac Mac
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