When you're reworking marine pumps, plumbing, and sanitation lines, the thru-hull fitting is the part that either ties the whole run together or becomes the weak spot. A 90-degree elbow helps in a tight space behind a sink or in a stern compartment, and the Marine/Boat 90 Degree Thru Hull Plumbing Fitting for 3/4" Hose is designed for exactly that kind of turn. It sells for USD 8.99, putting it in the replacement-part range rather than the custom-fabrication zone.
Quick verdict
If your hose run needs a 90-degree exit through the hull, this polypropylene fitting offers a straightforward solution with a material made for wet places. The UV and chemical resistance fits the marine environment, and the finished head plus single-pass nut keeps the installation simple. It is not a straight fitting, so the angle has to work with your hose routing before you cut.
Marine/Boat 90 Degree Thru Hull Plumbing Fitting for 3/4" Hose
Built from virgin polypropylene, this elbow is resistant to UV exposure and many chemicals you'd encounter in a bilge or sanitation system. The finished head presents a clean surface at the hull, and the single-pass around nut gives you one simple way to secure it from inside. The listed dimensions A 1-1/2", B 2-1/2", C 1", D 3/4", and E 1" let you check clearance before drilling. Choose it when you need a corrosion-free 90-degree path for a 3/4" hose; the limitation is that the 3/4" connection is fixed, so it's only the right part for that hose size.
Who it suits
This fitting suits DIY boat owners swapping out a tired thru-hull or rerouting a pump discharge, sanitation line, or vent hose in a cramped space. It's especially useful when a straight fitting won't line up with the hull and you need a clean, compact turn. Because it's polypropylene, it's lightweight and easy to handle, which helps when you're working in an awkward spot.
What stands out from the listed details
Material is the strongest point. Virgin polypropylene with UV and chemical resistance means the fitting won't rust or corrode like some metal alternatives, and it should tolerate the cleaning agents and waste-related chemicals common in marine sanitation. The finished head and single-pass nut are the other details that matter: they point to a part made for a neat, simple install rather than a rough casting. The dimensions give you enough information to confirm it will fit your hose run before you commit.
Meaningful trade-offs
The 90-degree shape is both the reason to buy and the main trade-off. Any elbow adds flow resistance, so for a high-volume pump discharge you should consider whether that turn is acceptable. The 3/4" hose size is a hard limit, so measure your hose's inner diameter to be sure it matches. And while polypropylene is great for corrosion resistance, it isn't a metal fitting, so it's not the right choice for high-torque or extreme-service installations. The carded pack suggests a single-repair purchase, not a bulk hardware supply.
Bottom line
For a 3/4" hose run that needs a sharp turn at the hull, the Marine/Boat 90 Degree Thru Hull Plumbing Fitting is a sensible buy at USD 8.99. Confirm the hose size, plan the route, and you have a simple replacement that keeps your marine pumps, plumbing, and sanitation working.
