DRAGONFLY Trimarans User Forum

Through hulls are National Pipe Straight Thread (NPST) also equivalent to British straight pipe (BSP). Look at Groco, Forespar pages among others. Google NPST and you will find a dimension table. On our boat head used a 3/4 BSP which is slightly over 1" OD. We replaced ours (all seven) with Gro...

DF 1200 Nice Tri. We have had Copper Coat on the boat since March 2019. Salt water canal Ft Lauderdale Fl. We try and sponge the hull monthly, but with all goings on, sometimes as much as 3 months between cleaning. Previously had Micron Ultra. Light weedy growth forms, easily wipes off with sponge. ...