1. Cov yeeb nkab sib txawv: 3- taw tes roj yeeb nkab tseem hu ua 3/8 inch yeeb nkab, thiab nws cov yeeb nkab txoj kab uas hla feem ntau yog 9.525 hli. Lub 4-point gas pipe kuj hu ua 1/2 inch yeeb nkab, thiab nws cov yeeb nkab txoj kab uas hla feem ntau yog 12.5 hli.
2. Cov roj ntim sib txawv: vim hais tias txoj kab uas hla ntawm 3-point roj yeeb nkab yog me dua, thiab txoj kab uas hla ntawm 4-point roj yeeb nkab loj dua, cov roj ntim ntawm 3- point gas pipe feem ntau me dua li ntawm 4-point gas pipes, thiab cov hluav taws xob kuj tseem me dua. Ib txhia.
Yog hais tias nws yog siv los ntawm cov tsev neeg zoo tib yam, feem ntau tsuas yog 3 cov ntsiab lus ntawm cov roj yeeb nkab tuaj yeem siv los ua kom tau raws li qhov xav tau ntawm lub neej niaj hnub. Yog tias nws siv hauv khw noj mov lossis tsev so, koj yuav tsum xaiv siv 6 cov ntsiab lus ntawm cov kav dej, vim tias cov chaw no feem ntau siv. Lub qhov cub kub yuav tsum muaj roj ntau dua.