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Each size fits multiple seacock sizes. Press threaded brass inserts into the hull side of the backing block into the holes that match the seacock flange. Rigid 1/2″ thickness provides secure installation but is flexible enough to conform to minor hull curvature. Will not swell or absorb moisture.
| Fits Seacock Sizes | Dia. | Insert Threads |
| 1250 & 1500 | 5.38 | 5/16″-18 |
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