The lines I created myself. I used 1/2" Swivel Adaptor, 1/2" End Cap, 1/2" elbow from DIG Irrigation; the line itself is 1/2" PEX line (50' for $13 @HD).
:-? I don't understand what you mean by, "main your own chambers".
The only GH products used were the grommets, in the chambers and in the...