đź”— All products, fittings, and tools used in this video can be found on my website: ThatRVtech.com đź”— More RV repair tips, training, and product recommendations: ThatRVtech.com
In this video, I show you how to properly repair the flexible plumbing line used in most RVs — the clear or milky polyvinyl hose that looks a lot like PEX but isn’t. This type of line is common in Forest River, Grand Design, Jayco, and many other RVs, but it’s often paired with the wrong fittings, leading to constant leaks and loose connections.
I’ll explain why the factory sometimes uses fittings designed for PB (polybutylene) plumbing, which are not compatible with the flexible 1/2” poly tubing found in most modern RVs. The inner diameter is different from true 1/2” PEX, and that mismatch is the main reason you see small drips or fittings that won’t stay tight.
Here’s what you’ll learn: • How to identify the flexible polyvinyl hose in your RV • Why PB fittings don’t seal correctly on this type of line • The correct fittings and clamps to use for a leak-free repair • Step-by-step instructions for cutting, fitting, and crimping properly • Tips for long-lasting connections
This repair requires no special tools beyond a basic crimper and a little attention to detail. If you’re tired of chasing down plumbing leaks in your RV, this is the proper way to fix them once and for all.
💡 Key takeaway: Matching the right fittings to the right tubing makes all the difference — and saves you from constant leak headaches.
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