This 4-inch drain testing stopper is designed for sealing or blocking off drain pipes ahead of air testing procedures. Manufactured in steel and fitted with a protective plastic thread cap, it is suited to frequent use in plumbing and drainage works.
Commonly used on-site for isolating pipe sections or facilitating pressure testing, it can be tightened or released using the integral wing-nut. The stopper may also be adapted for drain testing with a 1/2" BSP nipple cap as required.
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