John Guest 12 mm Tube Support Insert – Push-Fit Plumbing Stiffener (Model 005443)

Ensure a secure push-fit seal in your caravan or RV’s plumbing by using the John Guest 12 mm Tube Support Insert (Model: 005443). Designed to reinforce soft tubing and prevent deformation, this essential insert maintains pipe shape for a reliable connection—especially crucial in hot water systems.

Key Features & Specifications:

• Enhances Push-Fit Seals: Inserts into 12 mm tubing to keep the pipe rigid and round, ensuring a tight, leak-free connection in push-fit fittings. 

• Ideal for Hot Water Lines: Strongly recommended for higher temperature applications to prevent pipe shrinkage or collapse. 

• Simple DIY Installation: Slide the insert fully into the cut end of the tubing before fitting into any Speedfit or compression-style connector. 

• Compact & Durable Plastic Build: Small enough to stay hidden and sturdy enough to support flexible lines without external fittings. 

• Widely Available & Affordable: Priced around AUD $0.70 each or in multi-packs; part number 005443, also WaterMark-friendly when used with Kitted fittings.