The Parker CPI / A-LOK Bulkhead Union (WBZ / BC) is a bulkhead union joining two fractional tubes. It comes in 13 size combinations with tube outer diameters from 1/16" to 1". CPI uses a single ferrule and A-LOK a double ferrule.
| Type | Bulkhead union: joins two tubes |
| Part Numbers | CPI 1-1 WBZ, A-LOK 1BC1 ~ CPI 16-16 WBZ, A-LOK 16BC16 |
| Size Numbers | Size numbers in the part number are in sixteenths of an inch (for example 1/2" tube = 8) |
| Connection Method | CPI: single ferrule / A-LOK: double ferrule |
| Material | 316 stainless steel (heat code traceable) is standard / Other materials: steel, brass, aluminum, nickel-copper, Hastelloy C, Alloy 600, titanium, 6Mo, Incoloy 625 and 825 |
| Material Codes | Material code added to the end of the part number after a hyphen: B brass / SS or 316 = 316 stainless steel / S steel / A aluminum / M Alloy 400 / HC Hastelloy C-276 / IN Alloy 600 / SS20 Carpenter 20 / 6MO 6Mo / 625 / 825 / T titanium |
| Note | For reducer sizes, call out the short end first |
| Sizes (inches): Tube O.D. by CPI Part Number (A-LOK Part Number) | 1-1 WBZ (1BC1): tube O.D. 1/16" / 2-2 WBZ (2BC2): tube O.D. 1/8" / 2-4 WBZ (2BC4): tube O.D. 1/8" x 1/4" / 3-3 WBZ (3BC3): tube O.D. 3/16" / 4-2 WBZ (4BC2): tube O.D. 1/4" x 1/8" / 4-4 WBZ (4BC4): tube O.D. 1/4" / 5-5 WBZ (5BC5): tube O.D. 5/16" / 6-6 WBZ (6BC6): tube O.D. 3/8" / 8-8 WBZ (8BC8): tube O.D. 1/2" / 10-10 WBZ (10BC10): tube O.D. 5/8" / 12-12 WBZ (12BC12): tube O.D. 3/4" / 14-14 WBZ (14BC14): tube O.D. 7/8" / 16-16 WBZ (16BC16): tube O.D. 1" |