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
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What is the hull cut out hole diameter needed to mount GRO-HTH-1125-S -- 1-1/8 inch hose
The actual measurement of the fitting is right around 1.3" so the closest hole saw would probably be 1-5/16" (1.3125").
JD Tech Associate
What is the inside diameter size?
At this time we do not have a customer to answer your question. If you need assistance please contact customer service at 800-423-0030.
have a 1969 Boston Whaler 13' classic. The thru hull hole diameter is 1 1/8" and the transom is 2" thick. Will this thru hull work on my boat?
This fitting allows hull thickness to 2.930"
what's the out size dia?
Don't know, will check when boat is out of water for winter
What is the diameter of the threaded portion?
I would by this product again
Easy to install, works great!
Great Lakes, Michigan
I will replace them all!
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!
Description is incorrect, Fitting OK
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.