Pumps and engines run quieter and with greater efficiency when an unrestricted flow of water is provided by full-flow fittings and hoses. Groco has designed these high quality 316 stainless steel thru hulls to reduce the risk of any mishaps occurring if a thru hull fails to do its job.
This Groco TH Series Stainless Steel Thru Hull has a locknut with bonding screw.