Cap contains a high grade O-ring seal.
Heavy duty marine 316 grade stainless steel construction.
High polished face for sleek appearance to match today's modern watercraft.
Complete with stainless steel retaining chain, to avoid losing or misplacing cap.

Fitment:.(Just For Reference).
Boats and yachts.
Caravans / campervans.
Motorhomes.
Trucks.
Tractors.
Trailer fuel tanks.