Iiswitshi zoxinzelelo lwe-HW18 zisetyenziselwa ukulawula uxinzelelo lwetanki phakathi kwamaxabiso amabini amiselweyo kwiicompressor zomoya eziqhutywa ngombane ezinamanqanaba amathathu. Ziyafumaneka ngevalvu yokukhupha, ethintela iicompressor ukuba zingatyibiliki phantsi komthwalo, kwaye ifumaneka ngeqhosha lokuvala ukuze icompressor inqunyulwe ngesandla.

Iiswitshi zoxinzelelo lweHW19 zisetyenziselwa ukulawula uxinzelelo lwetanki phakathi kwamaxabiso amabini amiselweyo kwiicompressor zomoya eziqhutywa ngombane. Zifumaneka ngevalvu yokukhupha, ethintela iicompressor ukuba zingaqali phantsi komthwalo kwaye ifumaneka ngeqhosha lokuvala ukuze kunqunyulwe icompressor ngesandla.

Iiswitshi zoxinzelelo lwe-HW20 zisetyenziselwa ukulawula uxinzelelo lwetanki phakathi kwamaxabiso amabini amiselweyo kwiicompressor zomoya ezincinci eziqhutywa ngombane. Zixhotyiswe ngevalvu yokukhupha, zinokuthintela iicompressor ukuba zingaqali phantsi komthwalo. I-lever yokukhupha i-auto-off ye-compressor yokusikwa ngesandla. Zombini iindlela ze-one kunye ne-four-port manifold ziyafumaneka ezibonelela ngokulula ngokufakelwa kweevalvu kunye neegeyiji.