These are 1/4″ compression nuts with gripper and sleeve sold in a 5 pack.
Lot of 2 Everbilt 1/2 in. OD Compression Brass Cap Fitting LFA-205
Compression Male Branch Tee 1/4 NPTx5/16 Tube ODx2 Connect
Proline Series 2-Pack 1/4-in Compression Cap Fitting in the Brass
5-Pack Everbilt 1/8 in. MIP Brass Pipe Plug Fitting LFA-710
2PK) Everbilt A-8 1/4 in. OD Brass Compression Sleeve and Insert
RAVEqc Quick-Connect Female Valve to 1/4 Male Compression
2-Pack 1/4-in Compression Cap Fitting
Proline Series 2-Pack 1/4-in Compression Cap Fitting
Stainless Steel Barbed Splice (Barb OD) 7/16 x 7/16
Products Archive - Page 6 of 10 - AquaNui Home Water Distillers
1/4-in Compression Nut Fitting
Proline Series 1/4-in Compression Nut Fitting
Viair 92951 1/8 Male NPT to 1/4 Compression Fitting
120PCS 1/4 inch Compression Fittings Assortment kit
40PK- Everbilt 1/4 in -20 Stainless Steel coarse Hex Nuts 800051