What is "sea gaskets"

Gasket \Gas"ket\, n. [Cf. F. garcette, It. gaschetta, Sp. cajeta caburn, garceta reef point.]

1. (Naut.) A line or band used to lash a furled sail securely. Sea gaskets are common lines; harbor gaskets are plaited and decorated lines or bands. Called also casket.

2. (Mech.)

   1. The plaited hemp used for packing a piston, as of the steam engine and its pumps.

   2. Any ring or washer of made of a compressible material, used to make joints impermeable to fluids.