Sealand 307231113 Reducing Adapter – 1" x 1.5" Hose Fitting
When a boat's plumbing layout doesn't quite match up, the Sealand 307231113 reducing adapter steps in as the simple fix. Built to bridge a 1.5" (38mm) hose down to a 1" (25mm) hose, it lets boat owners and technicians connect mismatched sanitation lines without cutting, splicing, or reworking existing hose runs. This part is commonly used in holding tank installations, discharge pump connections, and general onboard plumbing where hose sizes transition.
Made from durable PVC, this adapter is designed to hold up against the demands of a marine environment, including exposure to moisture and the wear that comes with regular use in a sanitation system. It's a straightforward, no-frills component, but it plays an important role: keeping hose connections tight and leak-resistant so the rest of the system can function properly. Many installers reach for this adapter specifically because it's a direct match for Sealand and Dometic sanitation equipment, saving time compared to sourcing a generic fitting and hoping it fits.
This part is also known by its earlier designation, 307341113, so if an older parts diagram or manual references that number, it's the same reducing adapter. Whether replacing a worn fitting or completing a new hose installation, the 307231113 offers a dependable way to keep a 1" to 1.5" hose transition secure.
Key Features
- Reduces 1.5" (38mm) hose down to 1" (25mm) hose
- Constructed from durable PVC for long-term use
- Direct fit for genuine Sealand and Dometic sanitation systems
- Compact, single-piece adapter design
- Cross-references to older part number 307341113
Applications
- Marine holding tank hose connections
- Boat sanitation system plumbing
- Discharge pump hose transitions
- RV and marine waste system installations
- Replacement part for aging or damaged hose fittings
Specifications
- Brand: Sealand / Dometic
- Part Number: 307231113
- Cross-Reference Part Number: 307341113
- Connection Size: 1" (25mm) x 1.5" (38mm)
- Material: PVC
- Product Type: Reducing Hose Adapter
Frequently Asked Questions
Q: Will the Sealand 307231113 adapter fit hoses from other brands besides Sealand and Dometic?
It's designed specifically for Sealand and Dometic sanitation hose systems, so while it may physically fit other 1" and 1.5" hose, compatibility with non-Sealand systems isn't guaranteed and should be checked before installation.
Q: Do I need any additional hardware to install this adapter?
Most installations use hose clamps on each side of the adapter to secure the connection, but the adapter itself doesn't typically require glue or cement since it's made for hose-to-hose transitions rather than rigid pipe.
Q: Is the 307231113 the same part as the 307341113?
Yes, 307341113 is the older part number for this same reducing adapter; Sealand and Dometic have since updated it to 307231113.
Q: Can this adapter be used on both fresh water and waste water lines?
While its primary application is sanitation and holding tank systems, the PVC construction can generally handle other onboard hose transitions of the same size, though it's built and marketed for sanitation use.
Q: How do I know if my boat needs this size reducer?
If one section of your onboard hose is 1.5" and it needs to connect to a 1" line, such as at a pump inlet or tank fitting, this adapter is the correct size match.
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