Comparison : Item # B1144-1, Vented Straight Brass Gage, 1 1/32” Sight Opening, 1/2” Diameter Glass, 1/8” Male NPT Mounting Thread
Item # B1144-2, Vented Straight Brass Gage, 1 1/32” Sight Opening, 1/2” Diameter Glass, 1/4” Male NPT Mounting Thread
Item # B1144-3, Vented Straight Brass Gage, 1 1/32” Sight Opening, 1/2” Diameter Glass, 3/8” Male NPT Mounting Thread
Item # B1144-4, Vented Straight Brass Gage, 1 17/32” Sight Opening, 1/2” Diameter Glass, 1/8” Male NPT Mounting Thread
Item # B1144-5, Vented Straight Brass Gage, 1 17/32” Sight Opening, 1/2” Diameter Glass, 1/4” Male NPT Mounting Thread