Diving regulators and their accessories are an essential item of dive gear; owning your own offers divers the comfort of knowing where and what your regulator has been through and that it has been properly serviced. Having your own regs also means the mouthpiece is your own, so it is clean and has not been in anyone else's mouth!
Many divers often buy their own regulators once they have logged a few dives or had a bad experience with rental kit.
Regulators are usually sold in three parts; The 1st Stage and Primary together, an Alternate Air Source & a Submersible Pressure Gauge.
When you buy a regulator the first part to buy is the 1st Stage and Primary, then the Alternate Air Source and Gauges. The hose for the BCD is supplied with the BCD itself.