While copper is malleable

This genuine McDonnell & Miller 21-12 part ensures your feeder maintains its proportional feed action without environmental interference

Using this in larger or smaller regulator bodies will lead to improper seating and gas regulation failure

including the Ultra-1 and Ultra-2 models

The center port features an 1/8" MPT (Male Pipe Thread) which uses dryseal taper pipe standards for a secure fit

Maxitrol R8110-13 Spring While copper is malleableWhen you are in the field, you need components that deliver precise calibration and long term stability. The Maxitrol R8110 13 is a critical replacement component engineered specifically for the RV81 Series and 210D Series gas pressure regulators. This brown regulator spring is designed to provide a specific outlet pressure range of 1. 0" to 3. 5" W. C. (water column), making it indispensable for low pressure gas distribution systems requiring exact