Figure 6. Assembly of PT-1 (foreground) and PT-2 modules. 



PIPE RETAINER 



FLOTATION CHAMBER 

 ( foom filled ) 



4 SECTIONS OF 2" STEEL PIPE 

 SCREWED INTO PIPE-CROSS 

 AT CENTER 



16" STEEL-PILE PIPE, 

 0.281" WALL 



Figure 7. Tire retainer at end of pipe. 



14 



