Using these clear tube connectors is very helpful in allowing you to visually observe the flow state and identify air locks or obstructions.

Also, squeezing the pipe will change the pump sound if the circuit is flowing successfully, so if you hear no change of note then the circuit is probably blocked.

The soft pipe can also be clamped shut to allow a pump to be changed without draining down the system.

They make a very easy and reliable seal on the pump with just hand tightening.

Hope this is helpful - Peter

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