Marine and RV Tank Accessories - Fitting Kits - Marine-RV Tank Accessories - Hawaii
RV & Marine Tank Accessories for a Seamless, DIY-Friendly Install You’ve found the perfect marine or RV tank for your road or waterways escapade. But now comes the challenging part: the plumbing. Maybe you bought a blank tank for a custom campervan tank installation kit, or perhaps the fittings on your new tank just don't line up with your existing layout. This is the critical stage where a simple mistake can lead to a major leak. You're probably wondering how to install RV tank fittings properly, and you definitely don't want to guess....
This is exactly why we've put together this collection of the best RV tank plumbing accessories. These are not just loose parts; these are all-in-one solutions. We offer a comprehensive tank plumbing kit for RV or boat applications, fitting relocation kits to fix a bad layout, and easy-to-use custom fitting kits that let you add fittings to RV tank walls with a simple, leak-proof seal. Whether you're building a DIY marine water system from scratch or making an RV tank plumbing upgrade, these are the components you need to do the job with confidence.
From RV tank outlet/inlet fittings and tank access plates to specialized holding tank pump-out kits, tank vent kits for RV, and dip tubes, you'll find all the marine tank connection hardware right here. Stop searching for individual parts. Get a complete kit for your upgrade or repair. This is the best way to ensure your RV fresh water tankRV fresh water tank or marine grey water holding tank is installed correctly and professionally.
The Right Kit for Every DIY Project
These accessories are designed to solve the most common installation challenges for RV and marine plumbing.
Install Fittings on a Blank Tank
This is the most common challenge for any custom build. Our Custom Fitting Kit is the all-in-one answer, providing leak-proof compression fittings and all the parts you need to add fittings to RV tank walls exactly where you want them. It’s the perfect solution for any DIY boat tank fittings project.
Relocate or Upgrade Your Plumbing
Bought a replacement tank, but the inlet is on the wrong side? Our Fitting Relocation Kit is designed for this exact problem. It provides the plugs to seal existing threaded openings and all the hardware to drill and install new ports, making your RV tank plumbing upgrade simple and clean.
Add an Easy Pump-Out System
Properly emptying a waste tank is critical. Our Holding Tank Pump-out Kit provides a professional, water-tight solution. It includes all the durable marine tank connection hardware and clear instructions to give your tanks the reliable maintenance port they need.
Ensure Full Siphonage with a Dip Tube
Have a tank where the only practical outlet fitting is on the top? A dip tube is the essential part that makes it work. This tube installs into your top-mounted fitting and extends to the bottom of the tank,
Create a Tank Access Point
Many of our RV kits include a tank access plate, a crucial component many overlook. This gives you a secure, sealable entry point into your tank, allowing you to easily clean it, service fittings from the inside, or perform future maintenance.
Why Buy Marine & RV Tank Accessories from Tank Depot?
Built for DIY Installations
Whether you’re upgrading your RV’s grey water outlet or adding a pump-out port to your boat's holding tank, our accessories are designed for simplicity. Most kits require just basic tools, and complete instructions are included—no guesswork, no special skills needed.
Custom Configuration Made Easy
Off-the-shelf tanks don’t always match your layout. Our fitting relocation kits and custom dip tubes give you the flexibility to place inlets, outlets, and vents where your plumbing system actually needs them. Pair these with our blank tank options, and you’ve got a fully personalized setup.
Marine-Grade, Road-Tested Materials
Our fittings are made from high-strength polyethylene and stainless steel hardware to withstand road shock, vibration, UV exposure, and saltwater corrosion. These are the same heavy-duty components used in our most trusted RV water tanks, marine black water tanks, and food truck grey water systems.
Leak-Proof Seal Technology
Most of our kits use Uniseal compression fittings—trusted by pros for their watertight integrity even under pressure and movement. These seals are engineered to expand around pipe connections, maintaining a tight seal through every twist, bump, and turn.
Complete Systems in One Order
Skip the parts store run. From deck plates to vent caps, NPT plugs to dip tubes, we stock what you need to finish your installation right the first time. And if you’re ordering a new tank from our site, bundling your accessories saves on shipping and simplifies your install.
Expert Support That Knows Tanks
Not sure which fitting works with your tank? Want to upgrade an older system? Our team is just a call or email away. We’ve helped thousands of RVers, van lifers, boaters, and mobile kitchen builders find the right solution—fast.
Complete Your RV & Marine Setup with the Right Accessories
Your marine or RV tank is only as good as the connections that support it. Whether you're installing a fresh water tank in a custom van conversion, upgrading the waste system in your RV, or adding a pump-out port to your boat’s holding tank, having the right accessories on hand is the difference between a quick, leak-free setup and a plumbing nightmare. At Tank Depot, we make it easy. Our full lineup of RV and marine tank accessories is built for DIYers—no expensive service calls, no complicated installs. Just dependable parts, smart kits, and expert-backed support to help you get the job done right the first time. Don’t leave your system half-finished. Browse our collection of dip tubes, pump-out kits, and fitting relocation kits today, and build the complete tank setup your vehicle, vessel, or mobile business deserves.
Need a tank too? Check out our top-rated Bait Wells, RV Black Water Tanks, or Marine Water and Waste Holding Tanks to complete your build.
