Reliable polyethylene back nut for securing tank fittings in caravan waste water systems. Provides watertight seal on 25mm BSP male threads, preventing leaks from grey water outlets and valves.

Made from UV-stabilised, glass fibre reinforced nylon for corrosion resistance and durability in harsh conditions. Hexagonal design allows easy tightening with standard tools.

• 25mm BSP thread size
• 46mm across flats (AF) hex head
• Includes sealing washer
• Saltwater and chemical resistant
• Hand tight plus 1-2 turns installation