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How difficult is it to use the connectors (barbed fittings)?
    All the connectors and pipes we supply are materials that not only are compatible with each other, they are what we choose to use when we install.  So they should be OK.  
The barbs (ridges) on the connectors grip on the inside of the pipe. Cut pipe neat and square, push over the barbs on the connector, ensuring at least 2 or the 3 barbs are covered. A gentle 'wiggle' action can help. The pipe does not need to cover all the barbs.
Sometimes, particularly when it’s chilly, dipping supply pipe polytube into hot water to soften it, will help ease the insertion of the barbed connector.  
Soapy detergent can help with the slip-on, but don’t use any other form of lubricant.