HM37A Series Horizontal Twist Manifold Adapter

The adapter is used on a direct mount system that domes off horizontally from the orifice fitting. Instead of using a 5 valve angle manifold, you would use this to make the angle from horizontal to vertical. 

The benefit with this design is that with a slight incline in porting inside the adapter, the condensation could flow back into the fitting and not pool in the angle adapter and be constantly drained. 

The design then prevents freezing if you forget to go out and drain it.