There's only two things you need to remember, when it comes to clamps:
1-the diameter should fit the tubing's ID. If the barb is smaller than the tube's ID (i.e. 3/8" barb with 1/2" ID tubing), you will surely develop a leak, either now or later.
2-Use a clamp, any clamp. It really doesn't matter which clamp you use, as long as it's also of the right size. The purpose of a clamp here, is to prevent a hose from coming off, if you accidentally pull on it, or if you have a setup that's really "tight". The pumping pressures are nowhere near high enough to cause a hose to come off, even if you had a Johnson CM30xxx.
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