These are ME threaded Water gauges for use on Miniature steam engines, traction engines, stationaty engines, locomotives etc.
3/8 x 32tpi C/W 7mm glass 55mm long
5/16 x 32tpi C/W 6mm Glass 55mm Long
1/4 x 40tpi C/W 5mm Glass 50mm long
3/16 x 40tpi C/W 4mm Glass 1 1/2" Long
These are manufactured items, so please allow up to 7 days for delivery.