I’ve had it awhile but it was from Amazon.
https://www.amazon.com/dp/B081Z1KR8B/ref=cm_sw_r_cp_api_glc_fabc_5sn1Fb97A8K8N
Unfortunately it took a bit to find bud it was from Amazon about a year and half ago. This will get you close.
https://www.amazon.com/dp/B081Z1KR8B/ref=cm_sw_r_cp_api_glc_fabc_5sn1Fb97A8K8N
Another Amazon option: Scientific All-Glass (14male) Tube Water Filtering w/Adapter for Pax3 Pax2 https://www.amazon.com/dp/B081Z1KR8B/ref=cm_sw_r_apan_glt_fabc_G3AT81X75MZDJYDH98YM?_encoding=UTF8&psc=1