Attwood 3880-1
3/4 in 90-degree thru-hull
A right-angle hose connection; listed for above-waterline installation only.
View exact fittingAttwood Marine Thru-Hull Fittings: Hose Size and Material Guide
Attwood Boat Thru-Hull Fittings: Hose Sizes and Materials
A boat's drain hose and thru-hull fitting must be matched by more than the outlet's appearance. Attwood has right-angle plastic fittings and stainless-steel barbed thru-hulls in different hose sizes. Compare exact manufacturer part numbers before replacing a damaged connection or changing marine drainage hardware.
Three details to identify on your existing drain
Hose inside diameter
Check the hose size printed on its wall or measured from the original fitting. The 3/4-, 1- and 1-1/8-inch hose connections are different sizes.
Straight or angled layout
A 90-degree fitting redirects the hose behind the hull where space is tight. A straight barb has a different installation envelope.
Material and location
Inspect the existing fitting and intended mounting location. Waterline position, drainage type, hull thickness and corrosion environment matter to a safe installation.
Important installation distinction: Attwood 3880-1 is a black polypropylene right-angle thru-hull identified for above-waterline use only. Do not assume the other fittings share the same installation classification, or that any thru-hull is approved below the waterline without its exact manufacturer installation specifications.
Four Attwood thru-hull MPNs compared
The following items are separate parts with different hose connections or body designs. The hose diameter alone does not determine the required hull opening or exterior flange size.
| MPN | Hose connection | Construction | Fitting style |
|---|---|---|---|
| 3880-1 | 3/4 in | 90-degree thru-hull | Black polypropylene |
| 66542-3 | 1 in | Barbed thru-hull | Stainless steel |
| 66543-3 | 1-1/8 in | Barbed thru-hull | Stainless steel |
| 66548-3 | 1 in | Barbed thru-hull | Stainless steel |
How these four fittings differ
3880-1: A 90-degree black polypropylene fitting for 3/4-inch hose. The right-angle form helps route a hose in limited space, but it is intended for above-waterline installation only.
66542-3 and 66543-3: Both are stainless-steel barbed thru-hulls. The first is listed for 1-inch hose, while the second is sized for 1-1/8-inch hose. Compare the original part number and hull opening before substitution.
66548-3: Another stainless-steel fitting for 1-inch hose. It has its own manufacturer identifier, so a matching hose size should not be taken as confirmation that its flange, thread or mounting dimensions are interchangeable with 66542-3.
Browse the corresponding Attwood products
Attwood 66542-3
1 in Barbed thru-hull
Stainless fitting for a matching 1-inch hose, sold individually.
View exact fitting
Attwood 66543-3
1-1/8 in Barbed thru-hull
Stainless fitting with a 1-1/8-inch hose barb, sold individually.
View exact fitting
Attwood 66548-3
1 in Barbed thru-hull
Separate 1-inch stainless fitting; match the original part number and dimensions.
View exact fittingBefore removing or fitting a thru-hull
Confirm the hose material and size, access to the inner hull, outer flange shape and mounting bore. Follow the fitting manufacturer's recommendations for sealant, backing and hose clamps. Any below-waterline connection should be selected and installed with the appropriate marine standards and safety requirements in mind. Never use an above-waterline-only fitting below the waterline.
For another brand's valves and drain outlets, see the Sea-Dog scupper valve and thru-hull identification guide. If you're checking the rest of a livewell drainage system, our marine livewell pickups and pump reference may help identify related components.
Frequently asked questions
Can I use a 1-inch fitting on a 1-1/8-inch hose?
Do not assume so. Match the specified hose connection size and confirm the complete fitting dimensions for a secure, leak-resistant installation.
Does a 90-degree thru-hull do the same job as a straight barb?
Both can connect a hose to a thru-hull opening, but the bend, mounting requirements and intended installation location differ. Choose by the actual system layout and approved application.
Can I replace 66542-3 with 66548-3 because both list 1-inch hose?
Not without checking the manufacturer drawing. They are separate MPNs, and the same hose size does not confirm identical mounting geometry.
Can I arrange local viewing or pickup?
UsedRVParts offers viewing and pickup in Kelowna by appointment. Confirm the item and arrange a visit before travelling.
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