BN-421A1/BN-421A2/BN-421A3/BN-421A4/
BN-421B1/BN-421B2/BN-421B3/BN-421B4
| Part Number | Inlet | Outlet | Length | Sensor |
| BN-421A1 | 5-bolt - 3 3/4" | 2-bolt step down | 6 1/2" length | w/out sensor |
| BN-421A2 | 5-bolt - 3 3/4" | 2-bolt beveled | 6 1/2" length | w/out sensor |
| BN-421A3 | 5-bolt - 3 3/4" | 2-bolt step down | 6 1/2" length | w/sensor |
| BN-421A4 | 5-bolt - 3 3/4" | 2-bolt beveled | 6 1/2" length | w/sensor |
| BN-421B1 | 5-bolt - 3 3/4" | 2-bolt step down | 7" length | w/out sensor |
| BN-421B2 | 5-bolt - 3 3/4" | 2-bolt beveled | 7" length | w/out sensor |
| BN-421B3 | 5-bolt - 3 3/4" | 2-bolt step down | 7" length | w/sensor |
| BN-421B4 | 5-bolt - 3 3/4" | 2-bolt beveled | 7" length | w/sensor |
Measurements Required