An UltraZap 40mm threaded tank union with O-ring gives you a watertight, screw-in connection through the wall of a tank or cistern: the joint is sealed by the O-ring instead of glue, and it stays serviceable. It’s the fitting for reservoir tanks, sumps and filter boxes in a pond or aquarium system, and for any tank-to-tank transfer line, including fish tank top-up setups.

Good to know:
– 40mm threaded connection
– Supplied with an O-ring for a watertight seal
– Seals against the tank wall without glue
– For tanks, cisterns, sumps and pond, aquarium or fish tank plumbing