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An automatically sealing boat draining device to be mounted in a hole passing through the transom of a boat, includes: a cylindrical housing with a drain hole; a ball valve assembly mounted within and removable from the drain hole; and a plug for sealing the drain hole. The ball valve assembly inclu

An automatically sealing boat draining device to be mounted in a hole passing through the transom of a boat, includes: a cylindrical housing with a drain hole; a ball valve assembly mounted within and removable from the drain hole; and a plug for sealing the drain hole. The ball valve assembly includes a ball, a sealing ball seat component, and a flow through ball seat component that are held within the drain hole by a retaining ring. A flow of water from the outer end toward the inner end of the drain hole causes the ball to seat in the sealing seat component and seal the drain hole. A flow of water from the inner end toward the outer end of the drain hole causes the ball to seat in the ball flow though seat component and permit the flow of water through the drain hole.

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An automatically sealing boat draining device to be mounted in a hole passing through the transom of a boat, includes: a cylindrical housing with a drain hole; a ball valve assembly mounted within and removable from the drain hole; and a plug for sealing the drain hole. The ball valve assembly inclu

An automatically sealing boat draining device to be mounted in a hole passing through the transom of a boat, includes: a cylindrical housing with a drain hole; a ball valve assembly mounted within and removable from the drain hole; and a plug for sealing the drain hole. The ball valve assembly includes a ball, a sealing ball seat component, and a flow through ball seat component that are held within the drain hole by a retaining ring. A flow of water from the outer end toward the inner end of the drain hole causes the ball to seat in the sealing seat component and seal the drain hole. A flow of water from the inner end toward the outer end of the drain hole causes the ball to seat in the ball flow though seat component and permit the flow of water through the drain hole. cific gravity of about 1.5 g/cc to about 9.5 g/cc. 18. The projectile of claim 17, wherein said weighting agent comprises tungsten carbide, bismuth, lead, or a combination thereof. 19. The projectile of claim 18, wherein said weighting agent is added in an amount of from about 2 g to about 15 g. 20. The projectile of claim 14, wherein said hemispheric interior volume and said frustum interior volume are separated by said circular insert. 21. The projectile of claim 20, wherein the contents of said hemispheric interior volume and said frustum interior volume are different. 22. The projectile according to claim 14, further comprising scoring on or in the surface of the hemispherical portion, frustum portion, or both, which scoring promotes fracture at the surface locations comprising said scoring. 23. The projectile according to claim 14, wherein said projectile lacks a centrally located indentation or depression. 24. The projectile of claim 14, wherein the width of said hemispherical portion wall, said frustum portion wall, and the width of the wall at the rim formed where said hemispherical portion wall and said frustum portion wall interact are about equal. 25. The projectile of claim 14, wherein said frustum portion has a length which is at least about equal to one-half of its diameter. 26. The projectile according to claim 14, further comprising a plurality of dimples which promote projectile accuracy, distance, or both. 27. A method of producing a projectile having a hemispherical shell and a cylindrical shell comprising: (a) injecting a linear polymer into a first mold, forming a hemispherical shell having a hemispheric inner wall, a hemispheric outer wall, an interior volume, and a fill port, said inner and outer walls forming a rim; (b) injecting a linear polymer into a second mold, forming a cylindrical shell having a hemispheric inner wall, a cylindrical outer wall, an interior volume, and a fill port, said inner and outer walls forming a rim which mates with the profile of said hemispherical shell rim and which mated profile allows capture of a circular insert; (c) forming a circular insert having a first wall which faces the interior volume of the hemispherical shell and a second wall which faces the interior volume of the cylindrical shell; (d) placing said circular insert between said