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Groco Stainless Steel Thru-Hull Fittings are have straight NPS barbed male pipe designed to be used with hose. Their stainless steel construction offers the ultimate in corrosion resistance and protection.
It is recommended that Groco SS thru-hull fittings only be used in low pressure applications.=Stainless Steel thru-hulls are the best choice for below-the-waterline use. They are supplied complete with a stainless steel locknut with bonding screw
October 3, 2022
The thru hull fittings went in as planned. The critical issue is to get a good seal outside and inside for a permanent watertight condition. One disappointment was on one of the fittings the barbed end was not fully round but I hope the flexible hose will compensate for that condition.
June 24, 2021
I replaced a plastic thru-hull fitting for a bilge pump in a mahogany 1961 Chris Craft and it improved the looks incredibly.
May 13, 2021
Used these to replace thru hulls on older GW. Outstanding product and highly recommended. Tool works well for 1" but not as good for. 1 1/2". Hard job working one handed. Rapid shipping and excellent support
April 29, 2020
Quality has always been good, fittings worked out great!
May 2, 2016
Easy to install, works great!
July 6, 2011
I used this to replace all the plastic thru hull fittings on my Grady White boat because the were cracked and leaking. These look better and definitely work better!
December 16, 2008
The description is incorrect for the SS thru hull fitting. It's not designed to accept a seacock or valve directly. Not enough threaded shank. It's designed to attach the hose directly. It appears Groco does not offer a full threaded SS hull fitting, just brass. Its still a good fitting. Lucky I was able to use it on another project instead on returning it.
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