E
Ermintrude
Unless you're in a remote rural area I can't see the point in stocking loads of fittings in the van?? That's what Screwfix, Toolstation, B&Q & the Plumbers' Merchants are for. You must spend a fortune on derv carrying that lot around?? The customer will pay for your trip to pick up materials.
If you buy in bulk you save a lot. I buy 15mm Yorkshire fitting cheaper than screwfix end feed.
You do have to buy a considerable amount. 300 15 York elbows at a time.