3-12 psi Adjustable Universal Deadhead Fuel Pressure Billet Regulator Red They have a fully adjustable

They have a fully adjustable mounting head and adapter fingers

but both factors can be equally important in a race car

Speedmaster freeze plugs will not rot out

they feature rubber inserts for better grip

They also feature precision-rolled threads

3-12 psi Adjustable Universal Deadhead Fuel Pressure Billet Regulator Red They have a fully adjustableThe needle and seat assemblies that are installed in Speedmaster carburetors can sufficiently control fuel pressure up to about 8 psi. If the fuel pump is putting out more than 8 psi, a regulator should be used to keep the fuel pressure within safe limits and avoid the possibility of flooding. Speedmaster manufactures a number of regulators for most any need.