I will attempt to explain what I want to do then the question. I have a 10 gallon cooler/false bottom for all grain. Mashing typically, 1.35 qts/lb. Value on mash tun to steel head pump inlet. Outlet of pump will have a throttle valve and a prime valve to relieve any air when starting the pump. All hoses will be 1/2" ID silicone. After throttle valve from pump line goes to a 25' stainless steel wort chiller coil in the hot liquor tank. The coil is 3/8". A camloc fitting will be installed on input and output of coil from 3/8" to 1/2". Output of coil 1/2" silicone to mash tun. Mash tun has a sparge installed through the top to rain on the mash for recirculation of wort. Question: Will I have any issues going from 1/2" lines to 3/8" stainless coil in HLT then back to 1/2" to mash tun? Next: Camloc fittings are for exchange from mash tun to valve output of HLT to sparge mash. By doing this it will allow me to get the wort out of the heat exchange coil and sparge. I thought 1/2" stainless or cu would be excessive dia hence requiring to much wort and starving pump. Comments welcome.