Hey Dan, it may be more custom than you are looking for but I have had great luck with this type of clamp. It is only a one time use but clamps very tight and barely visible. It is a shrink type and semi hard plastic tube that you use a heat gun to shrink. Comes in a variety of sizes and available at most automotive parts stores. Pictured installed on lower radiator hose at radiator and joining the heater hoses.
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