TENOB large nylon self bailers feature a nitrile one-way diaphragm which is unaffected by petrol, diesel or oil. It also includes a bung sealing plug.
The self bailer is available in 2 versions...
Rubber one-way flap with coarse threaded nylon nipple.
Screws into coarse thread standard size bung bases such as RWB1946, RWB1950 & RWB1951 shown on following catalogue page 292.