Tri-Clamp Blank Cap with 15NB / 20NB Female BSP Socket

Clamp end cap with centered female BSP socket (Water Pusher)

Used in brewery and winery cellar operations as a Water Pusher, this fitting combines a sanitary Tri-Clamp blank cap with a centered female BSP socket boss. It closes the end of a clamp manifold or transfer line while providing a central threaded port for utility water, gas purging, pressure gauges or drain fittings.

Half-threaded socket bore and BSP thread pairing

The cylindrical boss is threaded halfway through from the outer entry rather than tapped all the way to the clamp face. Because the source specifies female BSP without distinguishing parallel BSPP from tapered BSPT, verify the mating male thread form and thread engagement depth before assembly.

15NB and 20NB socket options across five clamp flanges

Both the 15NB (1/2 inch nominal) and 20NB (3/4 inch nominal) socket series are listed in grade 304 stainless steel across five clamp sizes: combined 1"–1 1/2" (50.5 mm flange OD), 2" (64 mm OD), 2 1/2" (77.5 mm OD), 3" (91 mm OD) and 4" (119 mm OD).

Axial length differences between port configurations

In the reference drawings, dimension A measures overall axial length across the cap and socket boss, while dimension B measures clamp flange outside diameter. Note that axial length A varies between the 15NB series (36 to 38 mm) and the 20NB series (35 to 39 mm), so check the exact row for your chosen clamp and socket combination.