Pye Barker Fire & Safety Inc
832 Purser Dr # 101, Raleigh, NC
(919) 779-4010
Is a good place for fills and hydro testing. You have drop off and pickup.
Edit.
Machine and Welding is great but they only do exchanges.
3401 S WILMINGTON STREET
RALEIGH, NC 27611
(919) 772 9500