Qhov no yog feem 4 ntawm cov yeeb nkab thiab cov lus siv, tsom rau cov yeeb nkab phab ntsa muaj qauv: phab ntsa sab hauv du nrog cov kab hlau reinforced spiral, ntxiv rau lwm hom yeeb nkab tshwj xeeb.

31. Yeeb nkab spiral ribbed:
Phab ntsa sab hauv ntawm yeeb nkab du thiab tiaj, thaum sab nraud phab ntsa muaj kab spiral reinforcement. Nws yog hom yeeb nkab tshwj xeeb uas muaj phab ntsa tsis zoo tsim los ntawm txheej txheej spiral winding.
32. Yeeb nkab phab ntsa tiaj:
Qhov no yog yeeb nkab sib npaug nrog phab ntsa sab hauv thiab sab nraud du.
33. Yeeb nkab txuas tshuab:
Yeeb nkab txuas uas txuas siv tshuab (xws li threaded lossis compression connections).
34. Yeeb nkab txuas elastic:
Yeeb nkab txuas uas kaw nrog elastic rings. Feem ntau, lawv tsis muaj peev xwm tuav tau axial loads.
35. Yeeb nkab txuas nrog solvent:
Yeeb nkab txuas siv tshuaj nplaum uas muaj tshuaj ntxuav.
36. Electrofusion yeeb nkab fittings:
Yeeb nkab fittings uas muaj hluav taws xob cua sov nyob rau saum qhov txuas.
37. Heat fusion butt yeeb nkab fittings:
Yeeb nkab fittings uas muaj qhov qhib loj ib yam li cov yeeb nkab, txuas siv heat fusion butt welding.
38. Heat fusion socket yeeb nkab txuas:
Yeeb nkab txuas los ntawm kev kub qhov hluav taws xob sab hauv thiab sab nraud yeeb nkab lossis valve kawg, ces muab tso ua ke kom yaj thiab sib txuas.