Those are just common brass nipples, connectors, adapters. You put them together in various configurations to get the connections you need.
Instead of using brass fittings to help make your connections, it would be better to buy new shut-off valves and hoses that meet your needs better. Instead of trying to reuse old ones.
Instead of using brass fittings to help make your connections, it would be better to buy new shut-off valves and hoses that meet your needs better. Instead of trying to reuse old ones.