6.096 cm (2.40 in) of 1.905 cm (0.750 in) diameter acetal
2.560 cm (1.008 in) Vernay Umbrella Valve (VA 6086)
O-ring
Empty 2-liter plastic pop bottle
Engine Lathe
Bandsaw
Boring Bar
1.905 cm (.750 in) 5C Collet
Grooving Tool
Turning Tool
Number Four drill bit
Fabrication:
Head with O-Ring Groove
Cut 1.905 cm (0.750 in) diameter acetal bar to 6.35 cm (2.5 in) length with band saw.
Using engine lathe profile outside diameter from 70° angled end, approximately 75% of overall length.
Drill on 70° angled end 1.778 cm (0.70 in) deep hole with diameter of 0.531 cm (.209 in).
Using boring bar, create inside diameter snap groove of 0.381 cm (0.15 in) with diameter of 0.66 cm (0.26 in).
With engine lathe, plunge and turn outside diameter o-ring groove 0.411 cm (0.162 in) wide.
Remove head and turn body around, 70° angle end being held by collet.
Profile 40° end to final diameter and overall length.
Assembly:
Slide Buna-N O-ring up 70° acetal head until locked in machined groove.
Snap vernay umbrella valve into drilled hole with snap groove.
Insert assembled acetal head with 70° angle into neck of liter bottle with water and folded vernay umbrella valve. Make sure valve is unfolded before use.