The conventional 2-1/4" Manifold gauge is lightweight with a slim design and uses a single diaphragm. The newer 3-1/8" and 2-1/4" gauges incorporate a dual diaphragm design which improves the longevity and reliability of the instrument. Standard markings are black and white.

2-1/4" UMA Mechanical (10-05564)
Manifold Pressure
(Dual Diaphragm)
Case: Valox 420 Plastic
Weight: 7.8 oz.

2-1/4" UMA Mechanical (10-05565)
Manifold Pressure
(Single Diaphragm)
Case: Cast Aluminum
Weight: 4.7 oz.