RV Plumbing Repair in Yorba Linda

Most coaches built since the late 1990s use PEX, a cross linked polyethylene tubing joined with crimp rings or clamps. It is flexible, it tolerates a freeze cycle better than rigid pipe, and it is repairable with basic tooling. It is also the reason we can fix most fresh water faults without opening more of the vehicle than necessary.

Older coaches, roughly late 1970s through the mid 1990s, may still carry polybutylene. That material became notorious for failing at the fittings and, in some cases, degrading from within after long exposure to chlorinated water. Finding polybutylene in a coach changes the recommendation: patching one failure on a system that is failing everywhere is spending money to delay a repipe.

The identifying detail is the fitting. Polybutylene systems commonly use grey or plastic acetal insert fittings with copper crimp rings, and the tubing itself is typically grey and comparatively rigid. PEX is available in red, blue and white and feels noticeably more flexible. We identify the material before quoting, because it changes both the price and the honest advice.

• PEX with crimp rings or stainless clamps on most coaches since the late 1990s
• Polybutylene on many coaches from the late 1970s through mid 1990s
• Copper on some older high end and bus conversion builds
• ABS drain lines to gray and black tanks
• Polyethylene or ABS holding tanks depending on the manufacturer

Yes, and the assumption that it does not is why we see it. Yorba Linda does not freeze meaningfully, but the coaches that live here do not stay here. Big Bear, Mammoth, the eastern Sierra, the high desert in January and every route through Arizona and Utah at elevation all get below freezing overnight.

The damage pattern is consistent. Ice forms first where water sits still with the least insulation: the water pump head, the low point drains, exposed lines in the wet bay, the outside shower and the water heater when it has been drained but not fully cleared. Splits are usually longitudinal along a line or a cracked plastic housing at a pump or filter.

The most common presentation is not a burst pipe at all. It is a system that seems fine until the coach is pressurized for the first trip in spring, at which point a split that formed in January starts pumping water into a floor cavity. That is why we pressure test rather than just looking for wet spots when a coach comes out of winter.

Access. A fresh water line is usually reachable through a panel, a cabinet base or a bay. A holding tank is strapped to the underside of the floor, frequently inside a heated and insulated belly pan, often with the frame, the axles, a slide mechanism or the exhaust in the way.

Removing a black tank on many coaches means dropping the belly pan, disconnecting the toilet flange from above, cutting or unstrapping the mounting, and manoeuvring a tank that is bulky and awkward out through a space it barely fits. Reinstallation is the same in reverse with new seals throughout.

That is why black and gray tank repair and replacement is published at $750 to $8,500 across 5 to 35 labor hours while fresh water plumbing service is $285 to $4,500 across 1 to 18 hours. The tank itself is rarely the expensive part.