This is a Vacuum Manifold. These are machined from a billet of Alloy and allow one boost/vacuum source to be easily split into up to 6 ways. So, one vacuum pipe in, and everything else out, like Boost Gauge, Dump Valve, Map sensor, Fuel Pressure Reg etc etc.
The 6 ports are pre-threaded to 1/8th NPT, but are closed at the bottom. You then put a 3-4mm drill bit down the ones you want to use, this allows you to keep the ones blank that you don't need. I have only used 3, so only 3 are drilled.
The 3 fittings you see are simply ones from Bailey, as used on their dump valves. Alternatively, steel-braided hoses can be used with proper Aeroquip style fittings if you wish.
£35 inc Postage. ***SOLD***