I have had great luck with Gast 3040 dry rotary vane pumps. You can find them used on ebay cheap. They have 30-40 cfm and will pull 23-25" of vacuum easily. I have used one for up to 1000 taps and lots of sap ladders. I power mine with a 2hp electric compressor motor from tractor supply. I have found them for as little as $35 at auctions.
https://www.ebay.com/itm/Gast-Air-Co...DxTc:rk:2:pf:0
Last edited by heus; 12-16-2018 at 07:57 AM.
1000 taps on vac down to 100+ buckets 99% sugars
2x5 SL Hi-Output Raised Flue Corsair evaporator
SL Short bank press with CDL diaphragm pump
Leader Micro 1 RO for 2024
Constantly changing
2010:36 gal 2011:126 gal 2012:81 gal 2013:248 gal 2014: 329.5 gal 2015:305 gal 2016:316 gal 2017:258 gal 2018:147 gal 2019:91 gal 2020:30 gal 2021:30 gal 2023:50 gal Total since 2010: 2047.5 gal
Tapping the same trees my great, great and great grandfathers tapped.