[hagcam]

Bill
HCV - is a height control valve, or it is sometimes called a Ride height control valve (RHCV). It s a valve that is usually attached to the frame of the motorhome, with a horizontal arm coming off of the valve assembly. there is a vertical rod that goes from the end of the horizontal arm, down to the axle where it is attached with a swivel and a bolt.
If the coach sits too low the rod pushes up, which causes the valve to direct air to the suspension air bags. when the horizontal arm is horizontal again, the air flow stops, It the ride height is too high, the arm is pulled down by the rod attached to the axle, and the valve vents excess air from the bags until the arm is horizontal.

I just replaced the three RHCV on my coach. I had a slow leak on the right rear one, that allowed the suspension to deflate in a couple hours.

I sounds like the attachment arrangement is a little different on your Newells than it is on mine.

Hope this helps.

Just saw Jon's post. I answered from he firs page.  Maybe mine will help a bit.

The RHCVs on mine have a metal heim type joint at each end, nothing rubber.