Have a look at our newest Multi size one-way non return marine valves. This non return valve has multi three barb sizes on either end which can be easily cut off to meet your required hose size.
Hose Barb Size - 25mm/32mm/38mm (1", 1-1/4" & 1-1/2")
Valves have a rubber one way flap (one way labelled on the valve) with stainless steel screws to reduce rust and corrosion on the valve.
Material Description: Black Nylon
Dimensions: 270mm x 70mm (Diameter - widest section)
1 x Multi Size One-Way Non Return Marine Valve - 25mm/32mm/38mm (1", 1-1/4" & 1-1/2")