GROCO Bronze High Speed Thru-Hull Fitting w/Nut 3/4". 3/4" Bronze High Speed Thru-Hull Fitting w/Nut Specifications for GROCO 3/4" Bronze High Speed Thru-Hull Fitting w/Nut: Manufacturer: GROCO Color: Black Features of GROCO 3/4" Bronze High Speed Thru-Hull Fitting w/Nut Designed for increased flow compared to standard Thru Hulls and with less drag NPSM / NPT combination thread C83600 Bronze Package Contents: GROCO 3/4" Bronze High Speed Thru-Hull Fitting w/Nut GROCO HSTH-750-W: Bronze High Speed Thru-Hull Fitting w/Nut 3/4"