Upgrade your Grainfather to cam lock fittings. 
Really easier to use and less contact time resulting in less opportunity to burn fingers. 

Includes:
1 x D cam lock
2 x A cam lock
2 x male to straight connectors. 

This allows you to upgrade your sparge arm to camlock and allows you to upgrade your counterflow chiller as well but requires you to cut off the thread on the current fittings with a hacksaw.