If by grey you mean sch 80 (dark grey) an industrial hardware shop will have fittings and pipe. One of the Lowe's near my house has limited selection if sch 80 stuff (but others are SOL).
Grey is usually Sch 80, but I heard McMaster Carr may carry Sch 40 grey.
Also... the European metric pipe is grey and seems to be around the Sch 40 thickness although the diameter is slightly different. I know the I-Aquatic zeo reactor uses metric and the 1-1/4" is not close enough to prevent leaks. Not sure what the ASM and Euroreefs use.
yeah lowes and homedepot will carry the gray pvc in the electrical, but if you want fittings and unions than your best bet is to look up your local irrigation supply store.
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