The Cowling Access Door and Install Kit gives you a great way of accessing any part of your engine without having to remove the full cowls.  Use over the oil dipstick, the coolant bottle or anywhere else that you need convenient access.

You just have to turn the winged 1/4 turn fastener and the little door pops straight open.

Retrofit to any aircraft, any engine, any material (fiberglass, carbon and aluminium).