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Prima Tech - Prima Tech Vac-Pac Hanging Vaccine Holder includes a heavy Velcro strap to hang your bottle on a chute, processing cart, post or shoulder.
A convenient way...
Jorvet - Replacement Washer and Piston Set for the Roux 50cc Pistol Grip Syringe
JorVet - Popular Style Transfer Needle has a concave metal plate where the finger can steady the transfer needle during mixing.