CH-15R/Y/B-SH
1/4" male x 1/4" female

CH-15R/Y/B-IT 5/16"
male x 5/16" female

CH-15R/Y/B -410SH
1/4"male x 1/4"female for R410

CH-15R/Y/B-410IT
5/16"male x 5/16"female for R410