These appear to be unused but will say they are used.
NOS Vintage ACME Air-In Valve Caps (Box of 5) for Use or Collectable for MANCAVE
2Pcs High & Low Pressure Car A/C System Valve Caps Core Air Conditioning Service
2x R134a High & Low Pressure A/C System Valve Caps Replacement Air Conditioning
Propane Tank Forklift Service Valve Pv3310 Pv 3300 7141m 7141f LPG Adapter Acme
PROPANE TANK FILLER VALVE PV2080 7547 7547B MANCHESTER WORTHINGTON ACME
1-3/4" Acme Propane Tank Fill Valve Plastic Cap w/ Tether - Forklift Tank-Pk 10
