There are three models of the 75 litre diesel tank

Cap & gauge

38mm deck fill

50mm deck fill

There are three modelsof the 50 litre diesel tank
A cap & gauge 

A 38mm deck filler.

A 50mm deck filler

The 25 litre tanks is approved to Australian standards AS2906.
The tank is built here in Australia.
The tank is the only rotationally made 25 litre tank in Australia.

The tanks comes in two models:
Cap & gauge
38mm deck filler with breather.

The 25 litre diese tank is appreoved to Australian standards AS2906
The tank is rotationally moulded.
The tank is available in two models.
Cap & gauge
38mm deck filler with breather