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Yamada Poly Roof Cleaning Pump- 3. 1 GPM, @100psi- 4 left, auction ends in 10 minutes. Check it out.

Would make a good backup pump or first timer pump for those new to the roof cleaning trades.

This is poly so it won't have the durabiliy of Kynar but should still work as a great small backup for a 1/2" Kynar when you need to eventually put a rebuild kit on the larger 1/2" Air Diaphragm.

This will not require as large a compressor as the 1/2" model NDP-15

The cost is really reasonable compared to a similar cost Shurflo or Delavan electric pump. Cost is just $160.00 plus shipping. The ebay seller is

Item number: 150205698684

surplusplating( 518)