Attwood Marine Double-Ended Thru-Hull Connector, 3/4 in Hose ID, 1-1/8 in Hole, White Polypropylene, Above-Waterline Only
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Overview
The Attwood Marine 3878-3 is a white polypropylene double-ended thru-hull connector for 3/4 inch I.D. hose, with a 1-1/8 inch installation hole size and a 1-1/8 inch maximum hull thickness.
It creates a clean pass-through where a hose needs to move through a bulkhead or tank wall above the waterline. The double-ended layout keeps the hose connection on both sides of the panel, and the 5 inch overall length gives enough reach for common marine plumbing runs without taking up much room.
This fitting makes sense for above-waterline drain, vent, or transfer lines where you need a simple connector that matches 3/4 inch hose and mounts through a finished surface. It is not a below-waterline thru-hull, so fit and mounting location matter before installation.
Key features
- Fits 3/4 inch inside diameter hose
- Double-ended thru-hull form for routing a hose through a bulkhead or tank wall
- 1-1/8 inch installation hole size for planning the cutout before mounting
- 1-1/8 inch maximum hull or panel thickness
- 5 inch overall length for reaching through the mounting surface and accepting hose on both ends
- White polypropylene body for marine plumbing use above the waterline
Compatibility and fit
This connector is a good match when your boat already uses 3/4 inch I.D. hose and the mounting surface stays within the 1-1/8 inch thickness limit. On small fishing boats, runabouts, skiffs, and utility boats, that usually means splashwell drains, locker drains, livewell or washdown plumbing, or tank and compartment pass-through points that stay above the static waterline.
Before ordering, check the hose inside diameter, confirm that a 1-1/8 inch mounting hole works in the available space, and make sure there is room for the hose bend radius on both sides of the panel. That matters more on tight transom corners, shallow lockers, and compact rigging spaces.
Installation and setup
Because this is a straight double-ended connector, installation is usually straightforward when the hose run is already planned. It suits refits where an older plastic fitting has cracked, yellowed, or started leaking around the panel, and it also works well when adding a new pass-through in a tank wall or interior partition.
For the cleanest result, use hose that matches the 3/4 inch I.D. size, support the plumbing run so vibration does not load the fitting, and keep it in an above-waterline location only. That makes it a sensible choice for owners who want a simple plumbing connector without switching hose size or reworking the whole run.
Shipping
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Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.
Delivery and tracking
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Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.
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Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.
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We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.