- 4" FNST X 2-1/2" MNST ALUM RL AHA4025F
| Female Thread Size | 4 in |
| Type | Female Thread x Male Thread |
| Female Thread | NST (NH) |
| Material | Hardcoat Aluminum |
| Lug | Rocker Lug |
| Male Thread Size | 2 1/2 in |
| Male Thread | NST (NH) |
| Weight | 2.046 LB |
| Female Thread Size | 4 in |
| Type | Female Thread x Male Thread |
| Female Thread | NST (NH) |
| Material | Hardcoat Aluminum |
| Lug | Rocker Lug |
| Male Thread Size | 2 1/2 in |
| Male Thread | NST (NH) |
| Weight | 2.046 LB |