Official AndyMark Update:
Everyone who purchased a 1.1 pump will end up, when all said and done, with the filter on the far left of this graphic.
Full disclosure this is the timeline:
We received 1 shipment of pumps with the filter on the left before kickoff. These sold out in a few weeks and we put the website out of stock until our second shipment arrived. We started sending out pumps from this second shipment without checking to see which filter was included. After a few days we realized that this second shipment had been packed with the grey filter on the right. As soon as we realized this we turned them off on the website, purchased the filter in the middle from a 3rd party and mailed out one per pump to everyone who had bought a pump that was from the second batch. When those people were taken care of we removed and threw out all the grey filters from boxes in inventory and replaced them with the 3rd party filter pictured in the middle. We then received a box of the small black filters from our supplier to make up for the ones they packed incorrectly. Today we realized the thread length issue and as of 4pm 2/10/17 if you order a 1.1 pump it will come with the small black filter pictured on the left.
Right now we are in the process of identifying everyone who ordered a pump from the second shipment and sending out the original, small, black, filter pictured on the left. We strongly recommend that once you receive the small black one you switch it. We have confirmed that there is not an interference problem with this filter as you can see in the pictures below:
Good filter installed on the back plate of the pump not protruding inside.
Bad 3rd party filter sticking past the back plate of the pump to the inside.
If you wish to use the larger black filter until your replacement arrives you should only install it 3 full turns. To assist in this you can wrap the threads in PTFE/"plumbers"/"
Teflon" tape so that it will get tight before it bottoms out.