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TomC · 09-20-2007, 07:40 AM

I find a shop-vac in reverse works better than a compressor trying to blow through a 1/4" fitting.

I took a rubber, no-hub, coupling with one end worm-drive clamped to the end of my shop-vac hose (about 1" in diameter) and the other end clamped to an assembly of ordinary plumbing fittings to allow connection to the pipe in my shower (with showerhead removed). This is the highest point in the system and when I turn the vac on (blow) and open the various faucets one at a time, residual water is blown out. This method nicely clears the shower mixing valve too.

09-20-2007, 07:40 AM	#16
TomC Senior Member Join Date: Apr 2004 Location: Lakes Region Posts: 819 Thanks: 42 Thanked 185 Times in 116 Posts	low pressure, hi volume I find a shop-vac in reverse works better than a compressor trying to blow through a 1/4" fitting. I took a rubber, no-hub, coupling with one end worm-drive clamped to the end of my shop-vac hose (about 1" in diameter) and the other end clamped to an assembly of ordinary plumbing fittings to allow connection to the pipe in my shower (with showerhead removed). This is the highest point in the system and when I turn the vac on (blow) and open the various faucets one at a time, residual water is blown out. This method nicely clears the shower mixing valve too.